system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does some TV-shows become worse when they become too popular?

Lost, Prison break, Heroes and even Sherlock. They all started great but went downhill as they got more popular. How is it that with more attention and money the directors/producers seem to just fuck things up?
gpt
tv shows start out with a good concrete idea. As a show gets more and more popular, networks put pressure on the creators to be even more popular than they already are. This means that creators have to start expanding on a fairly closed idea. This is the case with how i met your mother. That show was most likely only meant to run for 3 or 4 seasons, and as they kept getting renewed, the producers had to find ways to stretch the show. This generally leads to a lack in quality due to a hastily put together filler plot. This is what happens to most shows that get extremely popular.
tl;dr - shows have an ending already, you're just watching the filler.