OP is spot-on!
There have been some 1st year turnarounds, but they have almost always come at programs where the previous coach brought in loads of talent, but failed to use it effectively. The three most obvious cases in the past decade:
1. Urban Meyer at Florida (took over for Ron Zook),
2. Houston Nutt at Ole Miss (took over for Ed Orgeron), and
3. Gus Malzahn at Auburn (took over for Gene Chizik)
All three of those programs recruited spectacularly well in the years before the turnaround. We're not anywhere close to those situations. We're in the opposite boat --- we have very little talent and depth and have basically been turned into a bottom-tier SEC team talent-wise over the past five years.
We have to correct the talent gap to become competitive again. Whether Butch will ultimately be successful is an open question, but we do know that he's addressing the talent gap issue very well. Ultimately, we should start seeing tangible results by Year 2 or Year 3. If at the end of Y3, we're still going 5-7 or 6-6, that's probably a bad sign.
But it's completely unrealistic to have expected a massive turnaround in Year 1 given the dysfunctional environment Butch inherited.