Maybe you live in a gamer rich environment. But every place I've ever lived, it's very difficult to find 4 people who will play an edition of D&D, let alone willing to play different editions.
By splitting the editions even further, it makes it incredibly hard to put together groups because you might have 2 peopel who want to play edition A, 2 who want edition B, and 1 who wants edition C. That's not even getting into the style of games these people prefer, just systems. And the fewer groups there are, the fewer games are played, and that's a bad thing.
Fair enough, and that's a good point.
I've been fortunate enough to game with the same core of gamers since 1998 or so, with members coming and going, but generally staying for the long-term. It helps that one of them is my wife, and another my cousin, so people up and leaving is not an issue for me.
That said, no, we don't all agree on our favourite edition, heck, we can't even always decide on the same system, genre, or style of play, but we're all able to compromise. We all get turns with what we like best. My wife would prefer 2nd edition, I like 4th, my cousin likes 3rd, and another in the group likes whatever he can find the most loopholes in, but at the end of the day, we're all just glad to
play.
And personally, I like the variety, but I get that this doesn't work for everyone, and that's unfortunate, but you can't turn back time, and you can't prevent them from bringing out another edition, because it will happen sooner or later. Would I prefer later to sooner? Yes, yes I would. That's not going to make a lick of difference in the end though.