I actually favor the British model of very short "series", rather than 22-24 episodes per season. Let's be honest, when you have to write that many 48 minute episodes you're going to run dry in the idea department very quickly. The genius of something like Fawlty Towers is that you only have to write six scripts for a series, meaning you're not stretching for ideas. Imagine having to write 20-odd Fawlty Towers scripts, and assuming it's a hit and is renewed, that you have to do that for possibly five or six or more seasons.
Even the best shows will tend to run out of steam before they reach 100 hundred episodes. There's just no real way to keep any story going that long. You'll lose writers, even show-runners, and even where you can keep stable production and writing teams, and assuming you don't lose actors (or, as with The Walking Dead, you just wantonly kill them off in place of actually having to write anything good, preferring shock to substance), it gets damned hard.
I think Breaking Bad had it just about right, with an average of 13 episodes per season (though the last one had sixteen as I recall), and still managed to keep quality pretty high. If they had had to push that up over 20, they would have written budget and writing limits, much as happened with The Walking Dead. I see no reason however why you can't tell a story in a more British-style short series. Broadchurch did it in 8 episodes per series. You get to have a story arc without the filler episodes, which I felt often detracted from series like the X Files and Deep Space Nine.