I suspect that is a big part why he didn't get the prize and probably won't in the future. If I remember correctly, the Nobel prize commitee was already kind of annoyed that Elfriede Jellinek did not come in person to receive her prize, and Pynchon most likely would not even send a video message.

That, and the fact that there are, of course, lots and lots and lots of breathtakingly great writers out there. I've had the feeling over the past couple of years that the Nobel for literature was often given to authors the commitee felt deserved more attention.