I'm not a fan of Battle Revolution, though yes, being the first to random WiFi is worth noting, probably because I went into it thinking I was getting the next Stadium. And to an extent, I guess we got it, but when you look through the battle modes they just feel lacking. You really are limited even more than Stadium if you aren't using cartridge Pokemon, and then they give you modes where you basically play roulette and might get stuck with a Shock Wave Plusle against your own Garchomp or something dumb like that. That tower where fog shows up half the time isn't exactly good either, you're basically stuck running a weather team.
I can imagine that list of rentals for any possible Stadium 3 would get really long, but being able to figure out which ones could get you through modes that literally were about trying to strategize without too many gimmicks like that were what I liked about the Stadium series. Stadium 2 had some good things you wouldn't expect: Kadabra was incredible for Psychic and ThunderPunch. I think with time people would be able to come up with something to deal with even the many Pokemon we might have to face today. Remember, each stadium round only has 48 Pokemon to face, not the full roster. Also note that Stadium 2 started Little Cup, which I'm quite thankful for. The minigames there were fun but isn't what sold it to me, at least not more recently when I got back into playing them.
One more thing: Pokemon Snap was awesome. Seriously, it's hard not to love being able to take pictures of an Electrode mid-Explosion.
Of course, I imagine Nintendo, if they make another console Pokemon game, making it more like XD or Colosseum than what I'd hope for. I don't mind either of those games but I have a feeling they really don't want to bring back Stadium, even though I'm sure it would be very doable. There seems to be a lot of people hoping for a console RPG and that's probably what they'd try to make.