I think its too early to tell if they are truly expanding the market or selling to the faithful.
I bought a WiiU, an X1 and I'll buy a PS4 soon, but sales to myself and most others like me aren't expanding the market.
I've seen nothing to suggest that these new consoles are selling to those who weren't already in one camp or the other already.
If these sales continue at this pace, then we may have something, but the last gen was one of the longest and I feel that there was pent up demand by the established gaming market.







