I think most FSU fans realized the SEC was a pipe dream as Florida wasn't going to be forced by the state administrators a la Virginia with Virginia Tech to invite FSU into the SEC. On the B1G front I think FSU would go if offered, but I agree all that was a smokescreen by the B1G as you stated.
The B1G/SEC both want North Carolina if they are available as they are the crown jewel of the ACC due to the fact they OWN the NC market, are the flagship university, are a top 10 brand in college merchandize sales nationwide, and would automatically cause the cable channel of the SEC or B1G be on NC basic tier with fear of revolt from their fanbase if their games weren't available.(Also, NC is the fastest growing state IMO, as the Texas growth from the last census was mainly due to Hurricane Katrina relocaters.)
There would also be a huge revolt if the administration ever voted to have Carolina join the B10.
The difference between Missouri and Florida State was this I don't think the B1G realized Nebraska was available before they poked the bear. The B1G realized that whomever the 12th team was they would pay for their own inclusion due to the conference championship game. Missouri brought the St. Louis, Kansas City TV markets for the BTN, but only brought 3 star football and 4 star basketball. When 5 star football/2 star basketball Nebraska realized Texas A&M was unhappy and Texas always had the Pac-10 in its back pocket they smartly went ahead and started a public feud with Texas over its Longhorn network. Nebraska ALWAYS benefited from the Big 12 unequal revenue sharing along with Texas. Oklahoma, Texas A&M, and Kansas. However, they realized that Missouri was flirting with a spot that they were obviously better off taking and blaming their departure on Texas and the fact the Big XII never protected their Big 8 rivalry with Oklahoma. Nebraska realized that the stability of the B1G was better than dealing with the ego of Texas, but they along with Oklahoma always had significant influence in the room with Texas they just didn't have Texas Tech, Baylor, Iowa State's futures dependent on keeping Nebraska happy like they did with Texas. So, Nebraska took off and sniped Missouri's spot. Basically what Nebraska did to Texas was what Shaq O'Neal did with Kobe Bryant when he got traded from the Lakers. He went public and started lobbying bombs at Kobe/Texas and got public support for their departures and got all the blame put on the other party Kobe/Texas.
With Florida State I don't think North Carolina was ever threatened by the talk of them going to the B1G because if they were the 15th team who would have been 16? UConn or Georgia Tech? If Ga. Tech and Florida State went to the B1G then Virginia and North Carolina could call Mike Slive today and be extended invitations to the SEC.
An outstanding point. UNC was blessed to have options, should that have occurred.
The biggest mistake the B1G made was not getting 2 ACC schools and instead taking Rutgers along with Maryland.
I believe that Maryland was the only school that the B10 could shake loose. Because they were in such dire straits in their athletic department. Rutgers was chosen for the NJ TV market. It sure wasn't because of their great athletic accomplishments.
What this showed was the ACC wasn't as vulnerable as we were led to believe by the butthurt dumba$$es from WVU, and gives credance to the fact that Maryland left because NC St AD Debbie Yow left their AD program in so much red they had to wh*re themselves out to the B1G to keeps its AD afloat.
Another outstanding point.
The ACC can blame Maryland's departure on Debbie Yow. North Carolina KNEW it could live without Maryland. Taking Maryland hurt the ACC, but didn't wound it as honestly Louisville has better football and basketball in the past decade and has reason to believe it can be sustained. Florida State to the B1G wouldn't have harmed North Carolina one bit either as they knew the SEC/B1G BOTH want them, and honestly I don't know which the school/fanbase prefers over the other.