Technically any game can be ported to anything else given enough time and effort. What people have essentially said that the technical gap between say X1 and Switch means that the effort to port games to the Switch would be far too great to endure.

What's going to decide if the devs decide or not to endure the effort of porting is unit sales... If Nintendo indeed reaches 10 to 15 million units in it's first year, I bet they will crawl up the walls if need be to port their games...

Thats it. Return of investment. Simple as that. 

Even mobile phones have support for UE4, but you still missing a point, like wrote Switch has support almost of all available engines right of gate, and has very modern tools, APIs...all that make huge difrence compared to Wii U espacily in combination with hardware that is easier to work with, and thats why devs talking about Switch is very easy for developing and that is "light years ahead of Wii U".

I agree that we will start seeing stronger support with bigger 3rd party games only when Switch start selling better or have bigger instal base.

But even if its easeir to develop for, the specs and what actually sells are the primary barrier.

I don't think Wii and Wii U lost support because they were too difficult to develop for per se. If the demand was there, developers would practically remake a game just to support Wii. While Wii U lost support because games weren't selling well, not because difficulty of development.

Look at X1, its easy enough to develop for given its very similar to PS4. But there are a lot of games skipping X1 because publishers don't believe it has an audience there, primarily Japanese games.

Actually specs thing are similar to easy to develop thing, and those things are what makes devolpment easier for devs, but main point is instal base and popularity of platform.

Wii U losed support because terrible sales in its 1st year and point that Wii U actualy failed only after 1 year on market, Wii U actually had pretty strong 3rd party at launch, 3rd partys though  that after Wii and Wii U will be huge succes, thats why some of them are now much more caution. But again platform that is easy for develop is very positive thing, some devs will definitely decide easier to make game for sucha platform than for platform that is hard to develop for.

When I said specs I meant performance. Switch is still far behind X1 and PS4 capabilities therefore bringing high end games to that hardware requires extra work... which is probably why it launched with none and nothing significant announced. Development may not be easy enough.

But again, potential to move software is an even bigger factor than Switch's performance. Wii had very limited specs but its large userbase encouraged developers to support it. But it didn't do a great job selling 3rd party software so support declined quickly compared to PS360.

So again, the amount of support Switch gets depends on its ability to move games that aren't NIntendo games.

I know what you meant.

For comparison, Wii was 20-30x less powerfule than PS3/Xbox360, had motion controls and offcourse didnt had support for modern engines, tools...and still had huge numbers of Fifa's, NBAs, NHLs, Madden, NHL, NFS...while Wii U receives just one Fifa, one NBA, one NFS and actualy was little above PS3/Xbox360 in terms of performance, while PS3/Xbox360 still are reciving those games.

If mulitiplay sources saying that develpment is easy for Switch and huge difrence compared to Wii U ("light years ahead of Wii U"), you dont have any reason to suspect in that. But like I wrote, "Wii U actually had pretty strong 3rd party at launch, 3rd partys though that after Wii and Wii U will be huge succes, thats why some of them are now much more caution with Switch."

Speaking of Nintendo platform, for 3rd party most important is popular platform that sales, of course that changes are much higher 3rd party will have much higher chances to sell their game on platform like that compare to platform that doesn't sales.

I don't think from what I've read that third party multi-format games are selling well on Switch at launch. Just Dance etc. I think people are buying Switch for Nintendo games or third party exclusive games if good same as wii u. This may not be true in Japan but seems to be a repeating pattern elsewhere. There is a difference now in that a Switch purchase is also a portable game purchase but from what I've read it seems more like before.

As more information comes in, it seems the Switch performance level is a bit lower with 1 of its CPU's dedicated to the background operating system. So we shouldn't expect miracles its a fairly low performance system not far above wii u. The wii u struggled with frame rates compared to ps3/360 due to its slow cpu and limited memory bandwidth and as we can see with Zelda the Switch is only a small upgrade.

From what I've read elsewhere the Switch may be the first console to be emulated within the first year of launch such is the progress of hacking it and being based on a known chipset without customisation.

I think android and ios games are the most likely games to be released on Switch, these are easy ports well within the capabilities of the console and cheap to do. Nintendo themselves will do wii u, ds, wii, gamecube and 3ds ports. We may also see some ps3/360 ports and a few ps4/xbone ports for less demanding games. However I would of thought for third parties android and ios would be the main source of games.

Not only do we have to see the Switch sales momentum continue (which it may do) but we have to see third party multiformat games sell well. Maybe Skyrim will be important in showing such demand.

Lets not forget the history though, many games appeared on wii u late and were also technically very weak even compared to 360 and ps3 versions and they sold in very low numbers. We are many years on from this and Switch can only deliver performance marginally above wii u. Here in the uk there was an offer on xbox one for £113;

http://www.hotukdeals.com/deals/new-og-xbox-one-500gb-129-delivered-111-with-code-from-sainsbury-s-groceries-2639094

You often see ps4 at half the switch launch price plus one game, around £160.

The case for buying a Switch as a home console which would struggle against ps3/360 let alone today's entry level consoles is getting weaker by the day. It's really a fantastic portable with tv output but many have bought the Switch as a home console first.

Just to point that Switch has 2-3x more powerful than Wii U without technical gains from new tech/architecture.

Maybe Zelda isnt huge upgrade over Wii U Zelda (900p and better frame rate is decent upgrade), but there is huge upgrade in MK8 and Fast RMX.