I agree with you in that Drexel would be a step down, but I'd say that Temple is on par with PCOM in terms of the facilities that I've seen, and maybe they're even better. Temple do have their own level 1 ER which is nice...to be honest, I am waiting on a post interview response from them, and I am on the high priority waitlist at Jeff.
We all have our backups: MathTeacher, you mentioned you have a (or many?) previous acceptances and would give up your places at those schools if you got into PCOM, so you have at least one school that you have been treating as a last resort. There are people who beating the walls like you are, writing letters of intent to the place they got waitlisted at which happens to be the school you've already been accepted to, the one you'd drop in a heart beat if you got the PCOM acceptance. So I don't see anything different when people use PCOM in the same manner.
If I get in at Temple or Jeff then my space is open at PCOM. So, you'll be happy and I'll be happy. I already got into Drexel, but PCOM gave me more money and I dislike Drexel for many reasons, so I turned Drexel down. Someone from the waitlist there got in, so they are happy. Everything will work out. There's no need to knock other applicants: it is what it is, and you play the same game we all play.