The difference is that Coach Mac outgrew his position at Alabama after an excellent tenure in Tuscaloosa. CSU was happy to take a risk on such a star coming from the SEC and boy did it pay off after coach built it into a conference championship contender in 3 years. Bobo, on the other hand, is much less accomplished. I would venture to say that Colorado State would be much better off hiring a proven head coach instead of rolling the dice on Bobo. Georgia fans certainly want him gone though.
I'm curious to know why you think Bobo is less accomplished?
In McElwain's 4 years at Bama, the offense ranked in the top 5 in the SEC in yards and points. 2 of his QB's ended up in the NFL (only 1 is still there). Good recruiter.
In the last 4 years, Georgia's offense has ranked in the top 5 in the SEC in yards and points. 2 of his QBs ended up in the NFL (both still there, one a starter); this doesn't count the ones he tutored as just the QB coach (David Greene & DJ Shockley). Coached the QB who is the all time passing and TD leader in the SEC. Good recruiter.
McElwain has a few more years in football with a few other stops, but Bobo has done very well coaching QBs and running the offense at UGA. CSU did ok with the last guy they hired that wasn't a proven head coach. I see no reason to believe that Bobo wouldn't be successful at CSU, given his success at UGA and since McElwain left the program in better shape than he found it.