Future proofing isn't the goal, I don't think. This game had a lot of positive word of mouth after its shutdown. The revival from a new studio and publisher who weren't around to learn anything about its original downfall is probably just an attempt to see if that positive word of mouth can turn into sales.
To them, the problem was never that people couldn't play it after it shut down, it's that it didn't make enough money while it lived. Hell, if it didn't shut down as an online only title this studio wouldn't even have been able to buy it at all, that turned out to be a good part of the design for them.
Edit: to be clear, I'm not advocating for online only games, I'm just saying there's pretty much less than no incentive for them to care about that part of the game