Since 1939, there have been 20 teams which have won just one NCAA National Championship in basketball. Of those, Maryland is the most recent. There's no question the Natty was a tremendous achievement, one for which Terps fans should be proud; and one for which coaches, players, and everyone associated with the program at that time deserve kudos.
As a result, though, the fanbase - to a large degree - has become spoiled. We expect to compete for a Natty every year; or at lease be engaged in the conversation. The fact of the matter, though, is that there are very few teams in the country which have reached that point: Duke, Kansas, UNC, and Kentucky being among them. And even those programs have had stretches in which they were not part of the conversation.
UCLA has won more Natty's than any other school, but they're not in the conversation every year. From 1981 - 1989, for instance, the Bruins made the NCAAT twice, and were bounced in the first round both times; and they did become a fairly consistent participant in the NCAAs after that sub-par stretch.
And that's my point here. Maryland was consistently included in the NCAAT for more than a decade, and has since fallen on lean times. But, like UCLA - arguably the best college basketball program in history - the Terps can, and I believe will, return to it's glory days. That's not going to happen over night, and it's going to require some patience from its fanbase.
Mark Turgeon may or may not be the coach to make that happen; only time will tell. But in the meantime, we as fans, need to be supportive. Taking a short-term approach - one in which every bad loss and every lackluster performance feels like the end of the world - is only going to increase frustration. The more disgruntled the fanbase becomes, the less likely it is that Comcast will be packed, and the less likely it is that we return to those glory days quickly.
I've been criticized for being too optimistic, and relatively speaking, I am more optimistic than many commenters. I completely understand the frustration, and feel that frustration, too. I simply choose to try to see the bright side of things instead of falling into the "doom-and-gloom", "sky is falling" mindset that seems to have pervaded this site.