I'm sure you're not...but a lot of gamers are, which is really, really sad. And it generally is reflected in the tone of internet forums and associated media.
someone somewhere (GAF) said "boy, am i GLAD i backed the right horse" once in reference to them deciding to "support" Sony over Sega at the start of this gen, and i think for most people this sums up the situation.
Sony have provided over 10 years of guaranteed fun, and for people who like sony i dont' see any particular reason for swaying from that course (beyond the price, but lets ignore that)
however, there are alternatives for others to explore, but i think part of the problem is that the price of hardware is still prohibitively high that most users have to make a choice. Given that the financial choice is significant, then you need to be committed that you ARE making the right choice - that the $499 or whatever you lay down IS the best choice for you.
in some ways, i feel this insecurity about the product puchased spills over into console evangelism and hence we end up with threads like this.
of course, this theory does some discredit to people who are hard core fans of what sony have done, and the stark reality (as shane pointed out) that a large percentage of games are PS3 bound.
so um... yeah... not really sure what my point was, it's late already!