By viable gaming platform, I mean mainly to break through that perception that iOS users and the general mobile gaming audience has. The perception that Android users are cheap and don't spend money on games, and therefore don't make a game for Android your priority because it's not going to make as much money as iOS on launch.
I think they should make a second play store just for games. It'll just be a place to just showcase the good stuff, that's mainly paid. And make a requirement to get Google certified.
The second thing they should do is to make a gratis value add service with features along the lines of gamecenter/xbox live/steam where games can have cloud saves, achievements, messaging etc. (They already have messaging through google talk), they should make the effort to pull it all together.
It would be nice if they could have a best-in-breed device, but that is basically the Nexus 7 + Nexus 10.