I appreciate this point of view, and largely agree with it. But you have to admit, to the large irrationally orange tinted glasses portion of the board (I'm not saying you are one of those), the "withhold judgment until we see what the new offense looks like in September" will turn into "the season has just started and the offense needs time to gel" which will turn into "Lester just needs time to grow into the position, he'll be fine" by October and "oh man if not for this penalty and that drop and this interception these 3 games that looked like blowouts were really toss ups" in November. By the end of the season they will be saying how such good people the coaches are and we are lucky to have them and they should get another year because next year is the one it all comes together.
My broader point is that there is equal folly in being fatalistic and blindly optimistic (not referring to you Rocco, I think you are one of the more level headed ones around). Moves can be evaluated in time and context, while at the same time acknowledging the ultimate outcome remains to be seen. Having doubts about a move/hire does not make one a bad fan, and blindly shouting down any opinion short of absolute support does not make one a superior fan.
I'm on record as doubting this hire. I find it concerning that he has spent over ten, mostly unremarkable, years coaching TE's and has not had his services sought by other schools. I find some of the justifications written here to be hilariously forced and pained. But the bottom line is that I do hope he succeeds. However, it is possible to hope for the best and to expect the worst.