[hrktb]

It happens, but usually for some decent reason.

Some companies for instance have a very stable business and keep a stable stack, but then hit a wall when trying to hire. They'll see average people coming to them, but those are not as efficient as their current staff who is now super experienced and want people who can match them.

Or they'll try to find graduate level people to train forward, but newcomers have no interest in the old stack, as it won't pimp their resume that much to their eyes.

Solution: keep using trendy frameworks.

Veterans will be happy to see shiny things, recruiting becomes that much easier, buzzword capacity increases all other the map. And all of these have a real benefit, in people retention, hiring cost, marketing opportunities that can cover the man/hour cost of moving frameworks.