They have first party they should be able to bring in some games.

The problem with Vita is they didn't push hard enough for it and mostly they tried to emulate a PS3. The only magical thing that happened to switch is they tried to market this as a home console by loosely defining it as such. It's nowhere near the standard of a regular home console but hey people buying it and that's what devs care about.

If you think mobile games are something to scoff about, just look at the success some mobile games have right now. If Sony manages to 

I mean at this point, they have pathetic market share on their Xperia phones. They lost their portable gaming division. Regular home consoles can only go so far. People are becoming more outgoing and busier as time goes by.

The label certainly seems to have lost a lot of its value. MS are actively disregarding the concept, Sony currently seem undecided, portable gaming now includes an industry (mobile) with an entirely different set of generations, and the Switch looks set to spend a solid chunk of its life-span competing against 8th gen systems and their 'new but not a successor' upgrades. We can still call stuff gen [whatever], but the practical use for that label has diminished recently.

What I am trying to say is that we have no concrete reason to get rid of generations yet. We have NO idea what Sony and Microsoft are doing in the next few years. There is only assumptions
If the PS5 releases next year or 2019 then the gap between the 1st console and the 2nd console is normal. Right now we have no clue what Sony is planning . Will they just PC their systems and make them upgradeable like PS4 Pro or just release a darn PS5? Is Microsoft even planning to stay in the console market? 

So like I said until we have concrete evidence that all three companies are getting rid of generations than we can talk about the end of generations. Right now all this "end of generations" talk is just premature. 

I wouldn't say Sony is entirely free of fault with the handling of the Vita. Their management of the system hasn't been great to say the least, which I feel is partially the reason why the system struggled to sell, as opposed to shift the blame to the rise of mobile devices.

I'm not arguing that we should discard the label, i just think it has currently lost some of its practical value. "Console generations" as a basic concept has always been flexible (some of the older ones had comically large ranges), but its usefulness as something other than a general categorising system has likewise varied. The term only relatively recently gained its current popularity, and that only really because of how close nit everyone was for a while (Sony, MS, and Nintendo were all within 1 year of each other for both the 7th and 8th home console generations).

well now vita devs have a choice. go mobile or go switch.
then again the ones that would go mobile already did by this point so...

I was talking about dedicated gaming consoles... not phones. And it won't be long until Apple and Samsung eliminate them from the smartphone market either.

Sony is great at making and marketing home consoles. But handhelds and phones, not so much.

Dedicated handheld gaming is 100M at best right now, most likely 90M. Of course SONY doesn't see a viable market with Nintendo taking a large chunk of that.

The fact of the matter is mobile gaming is largely dominated by smartphones with a sizable but still niche chunk through dedicated handheld 3DS and maybe the hybrid Switch if you want to classify it as part of that market. I expect smartphones to continue to put the squeeze on mobile gaming leaving an ever smaller sized dedicated handheld market. Maybe the hybrid market the switch created will be big enough to handle pressure from both sides from smartphones and consoles. Time will tell.

Even more accurately, Sony alienated itself form the market by proposing an unappealing product in the first place and then by not supporting it.

Edit. I should also note that, since we normally adress the mobile market as a casual game market, by saying mobile took over PSP/PSVita you're implicitly adressing those consoles as casual gaming platforms.

Yes, this is true. Especially RPGs or anything turn-based would work very well with mobile devices. But Nintendo gets criticized for the price of Super Mario Run. It costs a fifth of usual games. Still too expensive for the mobile sector.