Bethesda can't do it. They aren't capable of a decent storyline. Their games are frankly beautifully done mostly empty boxes for people to create their own stories and mods in.
Hell, the Skyrim map is just masterfully done. If you follow the roads it seems big and expansive, and the cliffs/mountains exist to force the player to move around them. But there are lots of little paths and ways to shorten distances.
But a narrative driven experience like fo1 and 2? They don't have the skill.
They screwed up before with automated map generation, and admitted as much.
For Oblivion, they admitted that the Aelyid ruins were mostly computer generated, as well as a lot of the map. Which is why the ruins in particular were so forgettable.
I really don't think Bethesda's style ever suited Fallout, so I'm happy to hear they're not planning it. Originally these games were novelistic, bitingly witty, and thematically coherent. It should have gone to a developer who isn't obsessed with crafting loops, simulationism for its own sake, and common denominator storytelling.
Beyond maybe some better UI scaling and high DPI options, I still don't feel they need a remake.
If you want spiritual successors with moden engines, there are plenty of good ones. The Wasteland series is a good option. There are other indie titles too, like Underrail.
Good. I can maybe see the argument for a remaster that improves the graphics, but they don't really need a ground up remake in a new engine. Not as long as they're still playable on modern computers.