MOVE!! Personally I think you can find friends anywhere but the training and especially the care for your horse comes first.
Worse comes to worse, you go back to the old barn and wait for an oppurtunity for something new to come up
I'd move, it benefited me when I did and I was also able to try out a few awesome trainers and get a taste for some different teaching styles so go for it if you think it would help your riding in the long run
If the horses are aggravated and moody/never happy due to no proper care and you feel as if you aren't getting what you want or need out of your lessons I would move
always put your horse first! if you think they're not happy, move them. you can meet new people at your new barn
I was just in a situation like that and I decided to move. It was totally worth it because now I can get out to see my horse more and I know exactly how she is kept.
I would move barns if I was in this situation
Honestly I've been through the same experience, the care wasn't great and the best trainer I've ever had left the barn due to that. We started searching around and eventually moved to an amazing barn. If I were you I would just look around, see your options, and look at how it might change when you move. It doesn't have to be a decision that's made right away. But choose what's better for you and your horse. Not for the people around you.
I'd look at it from my horses happiness/healthiness point of view. If the care is better in the new yard and would improve my horses daily life I would probably move. Consider turnout facilities, how often they are mucked out and fed etc.
Also if the training is better I would move too. I moved from my old yard and it was the best decision I made because my riding has improved so much, I've made new friends and kept in contact with my old ones too!
Go to whever you think is better for your horse and your own riding. You can always keep in touch with those people and create new friends at a new barn, that's what I did :)
I moved barn but missed the Bonds I had at the other on so I go to both (it's expensive)