I understand what you are saying. I guess it all comes down to whether you want to see post-season play, or a number of W's. To me, which you want isn't really the question. The question is this: If the team improves a lot, the team's record should take care of itself, and so should any post-season play, hopefully.
Some will point to the 2000 football team showing alot of improvement, but only going 3-9. That is true, but if you watched that season, you would remember that the team was still pretty lousy at the beginning of the year, but by November was a totally different team. They finished close to .500 in the Big Ten, and their losses were much more competetive. So despite the 3-9 record, I was optimistic about the football program by the end of the 2000 season.
I expect I'll have similiar feelings by the end of next basketball season if the team really truly does improve significantly. I don't have "that feeling" by the end of next season, I will personally feel it's time we think about making a change, but only time will tell.