Sure, if you consider a lot of self-produced Youtube clips as C-movies. But I think historically B-movies were paid for by Hollywood studios (but given shoestring budgets). It's hard to imagine a time in history where the 50's and 60's didn't dominate with B-movies.

Perhaps with the collapse of the drive-in, the matinee, there has not been a compelling business model for the studios to finance B-movies for decades now.