My Theory

Well up until the late 90's and 2000's most networks had less competition regarding media, but with the surfacing of the public internet everything became even more fast-paced and I think many networks felt like they had less time to actually get their ideas sold to the public.

I think the whole mistake lies with many shows being pressed into the media system of the modern web-generation. They try to hard to appeal to an audience that is used to get their fun quick and cheap and in as many variations as possible. During that they sadly fire away good ideas like Better off Ted, without even thinking of the consequences that they are going to run out of concepts even quicker.
If they just tried to appeal to another viewership, I think they would stand a chance as a co-existing media beside the internet. The newspaper did it's job, too, while the TV became popular, so I think it's possible as long as they don't loose sight of what their potentials are...which they seem to do.

I wouldn't have any problem with watching a show running for a longer period as long as it gradually got better. Many concepts need a while to actually flourish, but well, the viewers they are adressing right now (which is of course the majority o people) need their meat fast and tasting of as much as possible.
Somehow TV just can't take it that they're no longer the ruling media concept.

And concerning Lushx77's critique of the show, I have to agree with asgstar33 there. Most of the things you criticized were actually the things that made this show for me. It never tried to be realistic but instead gave us concepts that are relevant to modern capitalist society, work and private life and overplayed them in a (for me) totally hilarious way.

I see where this can become a problem, because it actually calls for the viewer to get the abstract meaning. It bombarded you with so many absurd and surreal situations, while the approach towards sitcom that the average viewer is used to is nothing more than the term: situation comedy.
Better off Ted is not so much a situation comedy in a classical sense because it isn't filled with funny everyday situation. I can see how many people can have problems relating to that.

Regarding there mostly only being one writer, if I understood correctly, I think it might have been that which made the comedy of this series so consistent for me.
Instead of every 2nd episode having a totally different feeling, different way of constructing itself, it felt more like a whole. While most characters didn't have much time to develop, they felt so much more consistent than in many other series lately, where they have a hard time writing around the different ideas that the several writers throw into the pot.

Anyway, I really hope this series gets picked up by another network if that's possible. I just stumbled upon it a few days ago, because the German Comedy Central picked it up for next season and I just thought to try some episodes out beforehand, because I can't stand Porta de Rossi's German voice actress.
I was so sad to read that it was already cancelled again.