It's inevitable that we will get one in the future, not soon but eventually despite its sales. So what do you want it to be like? Bigger? Better screen, microsd support? 

More support from Sony.

As much as I would want that, I've grown to accept Vita's niche status and the fact that Sony could care less if it dies slowly and painfully.

support for sd cards would be great, or multiple mem cards even (got a few 8gb cards hanging about from those games+mem card packs)

I find it annoying also to have to switch cards constantly, for that can't wait till 64GB gets to the West, but even then its price is a crime in itself.

Freaking SD Card support!

That's my main gripe with an other wise near perfect system. Well, that and the shoulder buttons.

I'd want it just like the PSP Go: Dock it and able to play on big screen w/ DS3 or DS4 controller, smaller and hides controls.

Support for SD cards would be amazing.

I have doubts that Sony would make another model.

Aslong as they keep the Japanese games coming, i am fine. I got the first model and it works fine. The only thing i would change is make it a bit lighter, wich is something the 2000 models already does. But, i'm used to it by now anyways.

Well of course storage is a biggest issue.