I will be encouraged if they do make it but the notion that they will become some monster monopoly doesn't strike me as likely.
I have always appreciated the fact that I can listen to a favorite channel while doing long trips instead of searching around for something. It's a nice option to have when I am not listening to my iPod. I have had Sirius in my last 2 cars and do have it in my wife's X3. I would have added it to mine if it had been a factory option when I ordered the car.
I get XM at home as a part of DirecTV and do like some of the channels on there so have been waiting to see what the merger would bring in terms of receivers and programming before adding something to my coupe...