I agree.
Lets say that the PS4 completely overwhelms the Xbox 1 and Microsoft gives up on the console. In a few years, Sony will announce a PS5 with whatever restrictions and limitations they want, because the competition is dead and customers have no other option. Bad scenario.
I had an Xbox and a PS2, and then I had an Xbox 360 and a PS3. I have supported both companies until now. I will not be buying the new Xbox, but that doesn't mean I want Microsoft to lose the console war and leave Sony with no healthy competition.