Uk is going through a comedy golden age last decades. I attribute it to bbc doing an excellent job giving chances to younger comedians on gameshows like mock the week, qi, 9 out of 10 cats, im sorry i havent a clue etc... as well as the prominence of edinburgh fringe
I think this sort of talent development really is just about giving chances to new folks, its the risk averse large networks only re-hiring the same older folks that stifles an artistic sector, be it movies, shows, music, games, comedy etc
America doesn't know how to make comedy anymore. I blame Twitter.