Saban (and to a lesser extent, Kirby and Dabo) have ruined fan expectations for what is reasonable. That kind of clustering of titles (or playing for them) is absurd and, by definition, there is only a tiny number of schools that will be able to do it.
Look at the other programs who have won titles or been good at various points during last couple of decades, other than those three. LSU has won 3, and they are pretty spaced out (and their fans are perpetually upset at whoever the coach is anyway). Ohio St has won 2, and they are spaced out + currently hate their coach who hasn't won one. UF has 2, but hasn't been good a consistently good team in nearly 15 years. USC hasn't won one since 2004 and has had a lot of bad seasons since then. Oklahoma hasn't won one since 2000. Texas has one and a bunch of mediocre/bad seasons until recently. Michigan has one and was mediocre until Harbaugh's last few years. Florida St and Auburn each have one, but have also had bunch of terrible seasons. ND doesn't have any. Oregon doesn't have any. Penn St doesn't have any and hasn't played for one.
If Heupel is able to get us into the playoff about half the time that he coaches here, I really think that's all we can reasonably expect given our history as a program.
Overall, the only coach who consistently won/was in the mix for titles, never really throttled down/had bad seasons at some point, and never got chirped at by the fans was Saban. Yet a lot of people (not saying you specifically, just in a general sense) kind of act like what he did should be repeated at their school.