Yeah, and my Dad gets grumpy because no one makes movie musicals or westerns anymore.
The analogies are going to get strained pretty quickly. If all one cares about is "their game, their way", and find eventually that their game is no longer the favorite, and can't stand anything new, or can't find people who play their own game - despite the internet, then yeah, they're going to be miffed. Miffed in comparison to all the people who were unhappy when they weren't able to find other games.
Obviously, there is always going to be someone who feels excluded or is unable to participate as they may have in the past. Be that as it may, there are more OSR alternatives than you can shake a stick at. Naturally, there's D&D in its current incarnation. There are narrative, storytelling games. There's tactical games, you name it. Moreover, I think there's more games right now getting a good amount of traction because of actual plays, YouTube, people learning how to market their games, etc. This hasn't always been the case.