I found this post /r/FalloutFAQ a while back and thought it was rather interesting.
To summarize a lot of the post:
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In an interview with The Guardian Todd Howard stated that he's happy with the level availability games have due to backwards compatibility and that he prefers games like the original Fallout to be played the way they were originally intended. Skyrim being remastered was a product of special circumstances.
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A section talks about when Fallout fans thought Fallout 3 was going to be remastered in 2019 and the history of bad remasters
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There has been a bit of debate about whether or not the source code for the classic Fallout titles was lost.
(TLDR) Essentially there doesn't seem to be much interest from Bethesda.
Remakes:
Ceased development in 2019. Multiple YouTube videos are available showing off what was completed.
An attempt to recreate Fallout 2 in Fallout New Vegas. The mod author's VK page appears to have last been updated in April of 2022. The ModDB page was lasted updated in October 2017.
Designed to be an open-source version of Fallout Tactics
A remake of Fallout 3 in Fallout 4's engine. Was temporarily cancelled due to audio rights issues. Appears to still be under development with the release of their Fallout 4: Point Lookout mod in February of 2022. Their Discord may contain further information.
A remake of Fallout New Vegas in Fallout 4. I linked to the Nitter page instead of their Facebook/Twitter/Discord page so you can see their posts without logging in. The original web page linked in the Reddit post no longer works. Appears to still be in development.
Notable mentions:
Tried to revise Fallout Tactics from the ground up to create a better overall experience and restore lost content. Last update was in August of 2016.
A well known mod that combines Fallout 3 and Fallout New Vegas.
Ports of the original two Fallout games for modern operating systems (MacOS, Windows, Android, and the PS Vita).
fo2.exe is an Android port that is also available on the Google Play Store.
A recreation of Van Buren in Fallout 2's engine.
Another recreation of Van Buren but in the Unity engine.