The only reason I see why this couldn't work is less obvious to us players. There are people who buy plat, play a game and then move on to the next game where they buy even more plat. This has encouraged sts to bring out lots of games and kind of abandon the existing games, thinking it will earn them more money. Which is true in the short term.

A combined game would give a small short term drop in plat income. So this will only work if sts starts to understand that they need to consolidate their communities if they want to keep income in the long run.

I, for one, would buy the biggest plat deal there is for such a combined game though.