The Wii actually got some good 3rd party games, they just weren't the ones the PS3/360 got. It had games like Sin & Punishment 2, Tatsunoko and Capcom, House of the Dead: Overkill, Sonic Colors, No More Heroes and others.

Theres quite a lot of proof of games using all the ram, when I look at the games on PC (Forza Horizon 3, Quantum Break, Gears of war 4) you can see they won't run well with less then 4GB V-ram, and use around 2-3GB of internal memory too, on Xbox Settings, full hd on max settings or 4k pushes to settings only 8GB Vram and combined with a lot of DDR3/4 ram can handle

Battlefield 1 on medium settings also push memory hard (ps4/xbox settings) same as titanfall on the 60fps settings, so yeah, judging by the PC results, from many results, like guru3d, digitalfoundry, hardware.info and many many other sites that test these things, the consoles to use their available ram.

I believe the PS4 has 5GB and the Xbox One has 5.5GB (with no kinect support in game) available for games, also remember almost all games use heavy harddisk-cashing in combination with these ram requirements.

Now the most important part is, if you have less ram, it needs to be faster so you can load and replace the textures faster from going from scene to scene, one of the reasons the PS4 is superior in power is the difference in ram speed, the ps4 has something  around 17x Gb/s if I remember correcttly and the XBox close to 70GB/s with a Eram buffer, so the NX could potentially make up some lossess here if it has faster memory and a very lite (less then 512MB) operating system.

Else its going to be a complete mess in games like mentioned above and future titles like mass effect, bethesda games, red dead, a complete mess. It will (AGAIN) require additional time to push the games to a lower level of ram to function, not to mention, other things will be different.

People can defend Nintendo all they want its their right, its an amazing company that pushes their own technical limits and manages to make great games on weak hardware, but since the N64 until now they have alienated third party developers themselves, wether its the prices and limits of the N64 cardridges, weird small discs on the gamecube, or waving sticks in combination with weaker hardware, its their own fault.

Sales numbers will decide if switch makes an effort, but if the 4GB is true, developers WILL have to make MORE of an effort which meens again if the sales are low, third parties will avoid the NX like it was never build in the first place.

In terms of architecture X360 and PS3 were as different, if not more, compared to PS4 and XB1. For the rest I agree. The main point is, whether the Switch will get 3rd party games or not is due to single publishers and developers business decinions. It's not a matter of technical feasibility. It may be the case for a few games but not for 3rd party games in general.

I would add, 3rd party games sell pretty well on 3DS. On Wii/WiiU 3rd party publishers don't have a history of releasing decent games.

Because there is a info saying that Switch OS will actually use 800MB, and I having hard time beliving that Switch OS will eat 2GB and that they will leve just 2GB for games.

Thats just Nintendo PR because they have 3DS to sell this holiday season and at least until Switch arrives and because Wii U is already dead, from Switch video it's very obvious that Switch is hybrid.

And from the big guns, the Wii with it's 88MB of Ram in comparison to the 512MB which was in the PS3/X360 at the time was still capable of doing some damn nice ports of games like Call of Duty simply because when you have a console in 100m homes then companies are going to put in a bit of effort to get their games on them, because even if 1 in every hundred buys your game, you've still got a million units sold.

The power gap between the Wii and the PS360 was absolutely massive, yet there was still tons of games being ported to it all during it's lifespan,  WWE series, Fifa, Call of Duty, guitar hero etc. Third parties go where the money is, if the switch sells like hotcakes then games will go to it, wouldn't matter a fuck of if the thing was using a motorola 68000 with blast processing, companies will make games for where money is to be had, end of story.

Beacuse Nintendo console never had full 3rd party suport since SNES. You can bet even Switch is more stronger than PS4 Pro it woldnt had full 3rd party support.Look at list of Switch 3rd party partners and supporters and you will see what kind of games exactly you can expect for Switch.

Switch hardware will be more than enough for PS4/XB1 ports running at 720p, totally different thing some developer will make game for Switch.

Also Nvidia+ARM is very modern tech that is very easy to work with.

Do we have actualy prove that all PS4/XB1 games use whole RAM for games!?

You can always little optimise your game to run with less RAM, people forgetting that PS3/Xbox 360 have 256MB Ram for games and they still run games like GTAV or Skyrim. 3GB Ram for games will not be problem that Switch run PS4/XB1 ports running at 720.