At this point I think PrimeDice have money to burn on advertising, and they'll let anyone in. Whatever kind of exposure for them is basically the same at this point now.

As for Donu, there is no point to trade your coins for other, weaker coins. As some users in this topic have said, there is no reason to lose your mind over a geographical location as hashing power is something at could be manipulated or moved into different pools digitally, and none of the hashing power actually matters when it comes to a geographical location. It matters more when a pool has high numbers, nothing else.

You cannot be seriously worried about China as an area having the most of a resource that can be digitally moved. Would this be such an issue if the US had 70% of hashing power?