E-Bay, Pay Pal, Amazon, and so on will be forced to take part either in the short or long term.  Google is building their own form of a wallet for Bitcoin and once they hit the market with their new toy, everyone else is going to be forced to act or risk being left behind.  I believe the question is not fixed on; if they will take it, the question is when will they take it.

Either play the game or risk being left behind and trying your best to play catchup.