You are totally correct. A big banking Giat could buy them. Problem is if they do it would be for about 2 bucks a share. When Nat City was bought out it was trading in the same range as SNV is now. The price at the time was 2.42 a share. So dont get your hopes up for a buyout. Also...Nat City was larger than SNV. Also take into a coount no one will buy banks when every Friday the FDIC award banks for nearly free to the banks that can handle the debt they have.
In the end dont hope for something that will loose you money fron current values.