Some players think nothing of jumping from guild to guild. I don't move around alot, and even so I've been in 4 guilds with my main character. But the majority of my time has been spent in one guild.
Things are fine in the guild I'm in, but it is a raiding guild and I don't raid anymore. Raiding is not a requirement, so I'm free to stay. However when everyone around you is raiding and you're not, it tends to be a bit isolating.
Now that I'm playing alts again, I think a new guild may breathe some fresh air into my gaming. Being involved in chat that isn't centered around the next raid boss may be more interesting and on what are normal raid nights, not so barren.
Even if i decided to leave, I don't know if I can find another guild at this point. Most of the guilds I've been in I found through playing with a random person while leveling up alone.
I have a few alts that are unguilded. Maybe I can join some different guilds on each of them and see if I find a good fit.
3 days ago