Well, it's like Paypal now ... 70% of all seller in the world accept this ... with a "hell" of fee and chargeback.
So, when sellers realise that Bitcoin ... have nos fees and NO CHARGEBACK, the world change.

We, the bitcoiners, are like Eobard Tharwe in Flash Serie.
We look the world with a winning view (after the sellers accept bitcoin massivly).
and it's good.
6300 nodes of bitcoin do this at this time.
Of course sellers should be taking Bitcoin. But you need to move the
buyers to use Bitcoin and to accept the fact that they don't have protection from scams. I love to take Bitcoin, but to pay someone in Bitcoin, you need a little trust that you're going to get what you paid for.
Paypal is good for buyers on eBay; Bitcoin may not be.