What are they going to regulate exactly? The minimum time a games online service should continue to run after it has been withdrawn from sale? They have to define how long they expect the game to run for up front?
If a game is sold at up-front cost or with significant in-game monetization, there should be some guarantee to the consumer that the online services will remain available for a reasonable time. If you ask me, reasonable is at least the lifetime of the platform's back-end (PSN).
There will always be exceptions such as developers/publishers going out of business, but when a company like Sony releases a game with an upfront cost and sells millions of copies - they should not be allowed to decide to stop maintaining the online servers after a handful of years.
Due to licensing complications, it is understandable of them to stop selling the game.
I don't expect them to continue hosting events for the game or provide specific support, just keep the servers up - they can afford it.
We also need regulation in the mobile/free to play space - mobile releases shouldn't be able to just disappear from libraries or become unplayable. At least launch an 'offline' version of the game with all purchased content available to the user, if the game is being retired. And any game that relies on online matchmaking should have either bot support or offer peer to peer matchmaking as a fail-safe option.
If no action is taken, gaming preservation moving forward will almost be impossible - so many experiences will be lost to time. I don't think these are unreasonable demands.