If I stopped talking to "friends" of mine because of game choices I don't think I would have considered them friends to begin with. Really remote acquaintances would seem more likely, and if game choices created that type of a rift then I think that I wouldn't want to be playing any game with them anyway.
Well, I've invited them to stuff. We haven't completely stopped talking. But I have quite a few friends. Most of them I made from gaming. I used to run Living Greyhawk events in our city and there were about 30 regulars who showed up to play, all of whom I considered friends because we'd get together to play D&D 3 times a week for 4-5 hours and periodically for non-D&D stuff.
A number of them have just started new groups playing 3.5e and became close friends with their new groups. I only have so much time to spend with friends and so do they. So, we drifted apart when we weren't seeing each other weekly for gaming.
I play with my friends because they are my friends, I could hang out with them doing mostly anything, even playing a game I did not entirely enjoy. The purpose of getting together at that point is being with my friends, the game itself is much-less important.
Not for us. I got together to play D&D and became friends with the people I was playing with. My friends have come and gone but my interest in D&D has remained constant. I am still friends with precisely ONE of the 13 people in my original D&D group from 20 years ago and the 20 or so people who joined and played in my group at one time or another.
My current group is made up of almost entirely people who joined it 3 years ago after my last group fell apart when one of my players got married and decided he didn't have time to play anymore and took his wife with him(they were both members of our group), we didn't have enough people to play anymore so we took a break. One of our members got frustrated at the lack of playing so he immediately went out and joined the Pathfinder Society. He's since decided that he hates 4e and wouldn't come back even if we asked him to.
All of us got together for one D&D Next playtest, for old times, but convincing everyone to show up was like pulling teeth because everyone was too busy with their own lives to make time for it. When our DM asked us to show up for a third session to continue the playtest half the group complained they weren't sure they could make time for a another game and they'd have to get back to us. When we didn't hear from them in a month, despite repeated e-mails, our DM gave up.
I haven't talked to most of that group since that playtest about a year ago. Our DM has since become obsessed with Pathfinder Society and every time I talk to him all he does is try to convince me to start coming weekly to the Pathfinder Society games. He gave me a Pathfinder novel for Christmas despite my repeated statements that I'm not a fan of Pathfinder. I even showed up to one game just because he wouldn't stop bothering me but it wasn't all that much fun, so I decided not to go back.
If I attempt to tell him about new playtests or how excited I am to see D&D Next eventually come out, he just changes the topic back to Pathfinder and the cool things you can do with it. I've realized that all we do is talk past each other so I don't really talk to him anymore. I'd like to talk to him but it appears that we have nothing to talk about when we don't have a D&D edition in common.