That's a lot like saying "we ban all murderers from being priests, even ones who don't murder people."
Yeah, that's it exactly.
I've tried to write about this before, that homosexuals in the priesthood are still homosexuals, whether "celibate" or not (but many are not, sadly).
There's a different scale involved here, and I am very glad to read that our new Pope is speaking to the heart of this issue. I am sure he'll now be mobbed with much evil but, well, he's doing the right thing here.
I'd even go so far as to encourage those disgruntled homosexuals currently in the Priesthood to go ahead and depart. I'm not saying they are not good people, but that they don't belong in the Priesthood. A lot of people feel as I do, from experience both humanly and with scripture.
Grow up!