Given Bethesda have f*cked it up twice in a row they should at least give Obsidian a chance to make a follow up.
That's quite impossible unfortunately, since Obsidian technically doesn't exist anymore as Furrnox already mentioned, and most of the old NV devs aren't even part of the new merged studio.
Fallout was one of my all time favourite franchises and nothing pains me more than to see Bethesda rape it not once but twice. I naively thought Bethesda would comeback strong with a Fallout 5, hoping to regain the trust of the fanbase in a similar fashion to how IO Interactive did with "Hitman™" and "Hitman™ 2", after they released that disaster "Absolution". Clearly I underestimated the unadulterated greed of major video game publishers in 2018.
And now I'm deeply concerned about TES: VI. God help us.