I wouldn't want to depend on only one altcoin. Nxt or Dogecoin can still disappear or be replaced. They are only 6 months old. Auroracoin or Quarks were 3rd months ago.
Their future should not influence CHA future. And 95% of people wont't play CHA if you choose a competing coin.

Silly question : Is there a way to use multiple blockchains, depending on speed or min-max levels ? In "real life", some games are instant and others are daily or weekly like lotteries ?