[tor-relays] Run a bridge or relay?

Hi all, I've been running a relay for several months now. In the last weeks I read a bit about the censorship in turkey and asked myself how to help if normal Tor services are blocked. Obfs4 could help. But on the pages from torproject about running a relay you are told to run a relay if you can and a bridge only under certain circumstances. But... are there enough bridges? If I were the turkey administration, I would try to block all the bridges I could find one by one. So... do we really have enough bridges out there?