i agree, get a case. the phone is too light and too thin, anyways. getting a case makes the phone size feel perfect in your hand while protecting it from drops, falls, and now to keep the logo from fallin' off.
but thanks for letting us all know. i was wondering about that.
if it happened to me, i wouldn't find it a big deal and i would just put a thin layer of super glue under it squeeze it back into place carefully. don't worry about squeezing glue out from the sides and just hold it for about 25 seconds then let go. you'll tear some skin off your finger but that's okay. get some some alcohol to clean up the area around the logo. after that it may even be more stable of a logo.
if you are worried about missing out on the logo, get the clear case. it's not for some people but i like it for the reason that i can see the logo. it doesn't add bulk either. in fact, my incredible with the clear case on it is still thinner than an iphone with no case.