They are accepting it, and have been for a few days. They accept bitcoin and monero, too.

They will build the platform on bitcoin,with  eth and xmr as alternatives, but many vendors will not accept them.

The problem faced is simply bitcoin and its confirmation time, which can be solved very easily.

BTC will reign unless something that is hard to predict occurs.

There are too many millions invested in it by parties that have power. Plus, BTC is the only cryptocurrency that people actively pursue ownership of.

Dabbling with ETH, is a way to increase the BTC you hold.