Something I thought about recently is that the debate about Camilla becoming queen might not end up mattering. The Queen, Prince Philip and their children seem to be healthy--really I haven't heard of any of them having a serious health complaint in their lives!--but Camilla has more health problems in her family--her mother had osteoporosis and her father died of cancer, although I think he was 89 or 90 at the time. But it occurred to me that Charles might very well outlive Camilla...and the Queen could outlive her as well.
I don't have a problem with Camilla becoming queen, though. I can't say I respect her for what she did before her marriage to Charles, but she seems to be a good support to him now. And you're right--adulterers aren't forbidden from being crowned. There is no reason why Camilla shouldn't be Queen Consort, IMO.
However, I agree with Zonk that Charles would seem hypocritical if he pushed for Camilla to become Queen, after saying she would only be known as Princess Consort. Even if it was the case that his intentions changed after his marriage.