Youtuber Accursed Farms (never seen any of his videos, but he seems to have a series of videos called Dead Game News which are about this topic, so it's certainly a subject dear to him) has made an official European petition (those petitions are called European Citizens Initiative btw, here's their website if you want to have a look what else is currently running) with the name Stop Killing Videogames, with the aim that Publishers must keep their games in a playable state, meaning they can't simply shut down the servers of GaaS and other online multiplayer games anymore if this comes through.

Here's a short video about it from EU Made Simple:

The petition in question: https://eci.ec.europa.eu/045/public/#/screen/home

And for non-EU citizens: https://www.stopkillinggames.com

The petition runs until June next year, but it looks like it can do it if the momentum can be maintained.

While in theory it sounds nice, I don't think it's feasible. At a certain point the playerbase of most game die, due to new games releasing. If companies need to keep servers running indefinitely and making costs indefinitely with almost no income that would reduce the interest in games with an online mode. A minimum online period would be nice though.

At that point, server costs would probably be very low as well. Additionally, it doesn't have to be the publisher/developer that operates the servers. Making the server software available would also help, and that's in fact exactly how PC games have traditionally worked (not necessarily that common anymore though). There's probably other interesting points as well regarding this, but those two come to mind immediately.

Yep, in the past, most online games were then taken over by the community and ran the game on personal servers with the source code or at least the executables readily available for download, as in most cases by then something like a NAS would be enough to run the game for the more limited number of players.