I think there are regulations to be set for that matter. There are sales tax to be considered and I guess government will look into it. Well, if that will happen I think its more convenient for bitcoin earners. But for now, I guess its too early to tell about it. The adoptation is not yet in full capacity.
It just depend on one thing: agreement by both the parties, buyer and the seller. If they agree with the exchange using Bitcoin it would be best and can happen. You talked about its adoption which is not in large capacity, for that I think every market takes time for its development. It is growing with the period of time and would reach its maximum capacity soon. According to this it may not be possible now but will happen in future, hopefully!