This seems silly to me. Especially without a rationale to back it. Just saying.
That being said, I'm OK with the fact that usernames just can't be changed.
Wrong. 50 BTC is 50 BTC, regardless of it's value in another currency. This is a Bitcoin forum, and I sometimes don't understand when people obsess with the value in another currency. If we lower it now, then we are dishonoring everyone who has donated in the past.