I can't decide if I want to jump ship for NASCAR or not... I know most people think NASCAR on the radio is a waste, but I'd rather listen to it on the radio than watch it on TV. The personalities that MRN and PRN carry are amazing, and when they get riled up, there's no place better to experience NASCAR than on the radio.
Fortunately for me, living in Indiana and Ohio, almost every little town has a NASCAR affiliate, so I'll just have to cross my fingers. If XM loses XM 173 (700 WLW) I won't hesitate to jump ship.
Unfortunately Sirius did grab full rights which I think is quite a shame. I really like XM a lot better as far as music goes but would really be missing my Nascar. I honestly don't know what I'm going to do as I really can't afford both.
I'm starting to hear that SIRIUS will put focused effort into programming the NASCAR channels. Look for multiple channels broadcasting pit/spotter/driver conversations and lots of statistics. This all sounds like NASCAR's "Trackpass" on the net. We'll see.