I doubt it's possible for legislation to mandate meaningful compliance regarding something as dynamic and rapidly evolving as online games. Despite good intentions, such legislation often results in unintended consequences including distorting the market, creating perverse incentives or even making the problem worse.
Serious problems are already apparent. Games offered “solely for the duration of [a] subscription." aren't regulated, which will greatly accelerate the death of perpetual licensing. A world where no games are available for outright purchase and offline use would be disastrous for players and historical preservation.
It would be better if they'd focus on narrower problems where they can make a positive difference. For example, mandating a freely distributable end-of-life patch to remove online activation from DRMed games. Creating a patch and uploading it once to the Internet Archive isn't a big enough burden to make companies modify their biz model or deploy armies of lawyers and MBAs to circumvent. When it comes to rapidly evolving technology, the best regulations are clearly defined, narrowly scoped and cheaper to comply with than avoid or game.