I think it is too late to switch now. Too many people are used to using BTC.
I think that franky1's post summed it up best:
XBT for forex BTC, BTC and bitcoin for common people
GBP for forex £, quid and pound for common people
USD for forex $, bucks and dollar for common people
now i think that wraps up the argument
That there makes sense, how BTC should be used as an informal reference to the actual 'currency'. That would therefore mean that it isn't too late to change. Technically it's never too late, just that the longer you leave it, the longer it takes to establish itself.