If I'm correct, actors in Europe have no problem doing a TV series. So I think saying Simon Pegg would refuse to do television is just not so.
It's only in the US that there is a stigma about it. And this stigma is considered old fashioned these days, I'd say, as some TV productions have become worth it for the actors. Such as Oscar winner Mary McDonnell doing nuBSG or the cast from Deadwood, etc.
After all, with such a large cast they wouldn't get to shine nearly as much as in a serialized show. If Star Trek, some years from now, is produced for television in a big way I'm guessing the actors would love to be a part of it.