Only other collection I'd be into is a Legends one. Problem is that's barely three games if you include Misadventures of Tron Bonne. (which you should)
I might want something even less likely to happen than a Legends Collection:
The Rockman World series a.k.a. The Game Boy Mega Man games. I was so sad that Mega Man Mania, later rechristened the Mega Man Anniversary Collection for the Game Boy Advance, never happened. I only played the first and fifth games in the series, and while the former was just "okay" the final game was great! Since I still haven't gotten to play Mega Man 9, 10, or 11,* Mega Man V is still the overall best Classic Series game I've played.
*My computer cannot run anything beyond the first Mega Man Legacy Collection, at least according to specs O_o