There are a few factors to consider in how Peerplays works that contribute to this. First, ETH is faster than btc and has greater support than some other crypto currencies and it will depend on onboarding support what most choose.

Second is Peerplays profitsharing mechanism. With all the ETH wagered with the profit is then distributed to all PPY holders. This increases the holders of ETH and thus the utility. This will also increase the volumes and thus the market cap.

We are talking about a real working production level application designed to take on all markets. This impact will be dramatic.

Mind you if another crypto make a better showing in the network, all of that could shift.

Whom ever manages to be the crypto of choice in Peerplays for the end users will likely end up being the most dominate in the market.