If Xseed bringing out Cold Steel 2 next year would pose an issue, then I would question why there's more than just a handful of other games being released as well for those same platforms. If there was really a problem with releasing something on Vita in 2016 then I highly doubt we'd see all the announcements that have been made in the last several months. Neither system is doing poorly enough that releases can't still be profitable, especially considering the majority of them are ones that didn't have huge development costs or marketing.
That heavily depends on IP and publisher. For example, Namco did pretty good job with SAO (both games) plus it's an IP that a lot of people know. So one can expect decent sales in the West and the 3rd game which is coming for 2016 is PS4/Vita. Lost Song was also on PS4.
If you look at majority of releases its mostly PS4/Vita with very few Vita only titles (like Gundam VS which just came out of nowhere and is going to pretty much not sell) and really no PS3/Vita titles in 2016.
Trails has an issue with the IP in the West (witness SC sales, compounded by terrible marketing, release window and delays). PS3 is dead in software sales unless you are Call of Duty, EA Sports Game or something like that. It's bad enough right now, but in a year, it's going to be completely dead.
Vita is getting some games next year (surprisingly quite a few) but most are PS4/Vita combo again so YMMV on that. Cold Steel 2 does not have the luxury and most times sequel sales are worse (again, witness SC vs FC sales). We shall see, but I remain very pessimistic. Frankly I think Falcom and Xseed missed their opportunity plus Falcom being conservative and refusing to port to PS4 ala Bandai Namco.
Mind you, personally, I am excited for a lot of these old platform games and will be buying a lot of the Japanese output no matter what the system is like (heck, bought Summon Nights 5 for PSP
), but Neogaf is not enough for decent support and even here response to Cold Steel is low.