Not gonna happen. If GP was such a big deal in choosing a console, we would see the impact already but as it stands, Sony is dominating right out of the gates.
PC is a big dampener for this strategy, GP is undoubtedly a good pull for Microsoft, but not for their consoles in particular.
Also, the thesis presented here assumes that Sony will simply stand by and do nothing if GP changes the whole landscape. That will not happen, they are watching closely and will counter with something similar if the need arises.