Tron dropped a lot more than the others because it was artificially pumped, and then the whales quickly cashed out. I think it will rise more organically now at a much slower pace. However, the tron dogs will not do any favours for the already over bloated blockchain of ethereum. It has already been broken by kittens, now it will be the dogs. ~
The overall impact of CryptoKitties on the Ethereum's evolution is still to be unraveled imo. Firstly, the game is undoubtedly bringing a lot of new users to the Ethereum blockchain network contributing to the popularity of ETH. Secondly, by clogging the network, it reveals weaknesses of the current technology and thus is speeding up the resolution of the Ethereum's scalability problem.