XT'ers shouldn't be lobbying miners directly. They should first lobby the node operators, then the exchanges and payment processors. If they win those two battles the miners will follow.
Many mining pools have already indicated they want bigger blocks. That doesn't necessarily mean we'll see a switch to XT but if we start seeing the higher block version numbers increasing in number, it could start a rush to XT.
Or a half decent solution come out of the core team that addresses the need for bigger blocks but doesn't fork the network, raise the block size so large the spam bloat on the chain will render it humongous or move us from a team of core devs to two mavericks.