I've never understood the idea that Grand Game needs to be adjusted for inflation. Last time I checked, $10,000 is still a decent chunk of change, even if you can't buy a new car with it anymore. Furthermore, we have considerably more cash games than we did when Grand Game debuted, giving us a wide variety of top prizes ranging from $10,000 to $100,000. There is still very much a place for a $10,000 Grand Game, and if it means easier setups than was once the case and subsequently more winners, then I have no problem with it.
Plinko, on the other hand, is long overdue an overhaul of its money layout. Unlike Grand Game, easier setups won't translate into more contestants winning the top prize (or in Plinko's case, hitting the $10,000 slot more often).