Yes, I had to make the decision that quitting drinking was more important to me than my friends who I knew deep down were really just drinking buddies. Sure enough when I got sober, they stopped contacting me.
You don't want to hold on to people who aren't real friends...so like Carlotta said, if they drop you once your sober you'll know they weren't real friends anyways or people that you want in your life.
If you lose friends, you will make new ones sooner or later who will understand you and your situation.
Good luck!