I do think that we will start to see commercials that incorporate BTC or that they accept BTC...but they will be specific companies, like Overstock, etc.
Yes, I think first we will see "BTC accepted" in an ad.
Current overstock.com commercials already say "Bitcoin Accepted" in them. I've also seen Bitcoin on Conan, Parks & Recreation, The Good Wife, & The Simpsons to name a few.