I mean you're allowed to build up any expectations you want to. But consider this quote from Epictetus:
"Do not seek for things to happen the way you want them to; rather, wish that what happens happens the way it happens: then you will be happy."
I hope we can finally win a natty this year. I think we're in the mix, and I am thrilled to be the fan of a program that has done so many things right to be in this position. However, if my expectation become winning a national championship, or even making the Final Four or any other specfic result, I know I'm setting myself up for a possibility of being disappointed, even if the season is objectively good!
Of course it's probably not realistic, as a sports fan, to "wish that what happens happens the way it happens," that kind of goes against the whole practice of rooting for a specific team! But the principle that setting specific expectations sets you up for failure is pretty obvious. I try to think of things on a wider time horizon, and rather than specific results about general program health. Can we continue to recruit and produce all-conference players and NBA draft picks? Can we continue to make the Tournament with good seeding on an annual basis? Can we compete for conference titles consistently? If we're doing all those things, we're in the best possible position for the natty, whether it be this year or another year.