^ But would you be happy if the VII remake was on the Vita and not PS3?
They chose X because it's the easiest one to make to make in HD for. All you need to do is what, upscale the textures a bit? Anything from VI-IX requires way more work, you'd need a complete remake of all assets for a start, including backgrounds and movies. Not to mention the low polygon blockiness of the character models would put people off. Besides, if this was anything from VII-IX, people would be bitching that the originals were released on the PS Store months ago.
Oh and also, FFX is the most popular FF in Japan, if that 5 year old poll from Famitsu is still accurate. So, all in all it makes sense. I'm looking forward to seeing it. Because of the 2D backgrounds/plains, this could end up being really good looking on top of what is a great game. I guess what I'd like most of all is if the lip syncing was more accurate!
I don't see why games shouldn't be re-released all the time. Nobody is forcing you to buy it every time.
Nobody seems to care when music and movies are on newer formats, and in fact people tend to complain when their favourite films aren't on the newest format available. Who wants Jurassic Park on Blu Ray, it's readily available on VHS after all.