It’s a powerful card, but it’s not broken nor as widely useful as it seems at first glance.
First, it doesn’t help you win. What it does is let you play for longer, minimize exhaustion and prevent R&D from being satured with agendas. It won’t make you good at actually playing for longer. You would not jam Interns in every deck, so you shouldn’t do the same with Museum of History.
Second, it requires you to play 54 cards and needs to be protected. You could be playing 49 cards and protecting a SanSan, Daily Bussiness Show or Eve Campaign.
It works on the right deck, of course. Genomics benefits inmensely from being able to bring back its Hostile Infrastructures and Battys and does already excel in the late game. I also think it helps Foundry decks since a low-density R&D was a huge problem for them.
Other than that, I think people will eventually come off the card when they realize that recurring Turtlebacks over and over is not a great tactic. Give it time.