Maybe so, but, and I'm trying to speak on this from as far as away from a "slant" as possible (well, I am biased for 2D-gaming ^_^), you can't deny that recent developments may point in this direction.
Sony's hardware may be backwards compatible, sure, but the way they've been "treating" SNK, like they do in the States, is probably only going to get worse; especially now that an American, from the SCEA no less, is now in charge of the entirety of the company. Even if they do allow for the continuing releases for the PS2, who's to say that circumstances may push SNK to be forced to do more bundle packs & reduced prices to meet Sony's regulations for releases on the old hardware? SNK shouldn't have to put up with the likes of that, as it would only seek to cut into its profits.
And then there's Microsoft, along with their take on "backwards compatibility". Only certain games will actually use this feature, you say? What are my bids that the Xbox's small amount of 2D titles will end up being more than likely the ones getting the short straw with this arrangement, seeing that they're quite low on their overall demographic's food chain any way? Also, while the PS2 may hover around as an "elderly system", I wouldn't be so quick to say the same for the XBox. It seems that Microsoft and the majority of its fanbase couldn't be happier to jump ship with a fresh new start and phase out the old hardware as much as possible. And when that happens, SNK and its wares will be the least of what many people will concern themselves with, and I also doubt that SNK will press on with developing for the XBox itself. Maybe more of the likes of say, KOF MI 2 for the 360 will still be a nice way of doing business...
I'm not saying Nintendo is perfect, or that they're going to sweep the next gen, but with the whole "retro" charm of the upcoming system, it does seem to be the next gen console that would be perhaps most ideal if SNK wanted to be able to develop and port their 2D games without the likes of Sony's rather harsh edicts, or being victim to Microsoft's 3D game favoring hardware which may just as soon cut off SNK's 2D gaming entirely.
Of course, if Sega Sammy ever got the idea to really "console-ize" the Atomiswave hardware in the future (meaning actually making a console out of the hardware, like SNK did with their stuff), I'm sure SNK would be all too pleased to back 'em up on that, and I certainly wouldn't be either, if the price was reasonable enough. ^_^