Next year I am sure there'd be another model but i doubt it'd do hardware exclusive games. Older mode might just have slower load times or less multi-tasking features.. perhaps the new VITA having non-compressed wallpapers.
May have L2/R2/L3/R3, better wifi and slightly larger (for RP).
Yes. I'd easily buy it.
At most, it'd just make the VITA less irrelevant. Won't really change sales trend in the long run but Sony wouldn't probably lose much with it depending on their pricing or other schemes :P
I wouldn't want an even more cheap looking thing with more plastic. The og vita, looks premium, the 2000 is sorta toy-ish. If they are gonna make the 3000 something akin to the PSP Street which looks awful then they shouldn't bother.
The thing that bugs me about the N3DS is that it has a faster CPU that makes some of the new games that are coming out incapable of being played on the older model. If the CPU simply speeded up the load times and things of that sort I would be fine with that but making the older version obsolete is terrible. If they wanted to do this they should have announced a new system and not just an upgrade in this form.