I assume you mean by that that only conventially good-looking people will get TV work. I don't agree; Rebecca Adlington is a big name and would certainly be able to get work on TV, at least for a while. Of course, not all athletes do well on TV; the Australian Kathy Freeman tried it, was rubbish at it and vanished. Sue Barker by contrast proved a natural for it.
OMG, you choose to misrepresent what I posted yet again
! Where did I say she absolutely couldn't get any TV work? Please re-read: what I actually said was she'd be limited. Wow.