And, until last year, he had been to a Final 4 more recently than Syracuse. The tourney flame-outs are baffling, though in part that's because the team has been very good in the regular season for most of the decade Thompson has been there. And, as others have pointed out, the last coach was a disaster who, for good measure, sometimes looked like Adolph Hitler.
This year's team - once it lost Greg Whittington and Joshua, /k/a Josh, Smith - just wasn't very good and had a very low ceiling. I don't think it's an exaggeration to say Georgetown didn't have a single frontcourt player who would have started on any post-Celuck Syracuse team. (Trawick and even Bowen are fine players who have played at the forward spots, but they're really guards.) Is it Thompson's fault? I mean, sure, in part. But Georgetown had a lot of bad luck this year, and the program is never going to be one that has a big margin for error.
(The bad luck, all frontcourt guys: Porter leaving, which was not a surprise by midway through last year but was unexpected when he enrolled; Whittington getting hurt and then expelled; Tyler Adams never playing a game; Josh Smith getting suspended, although he was certaintly a gamble.)