It's a little bit interesting to read and think about at times... Basically... Fan theory stuff about games made by (some) of the same developers, and trying to find patterns in similarities. And I'll give it that much. But is it something I'd take super seriously, and go out on a limb describing as fast, or even so much as telling other people these things are likely? No. Theories linking TES to Fallout can be a bit fun to think about and interesting, but I wouldn't be going out on a limb telling people that it's official fact proven by the Devs, as some might.
I said "Some of the same developers" and take that with a huge grain of salt, cause even though Bethesda made Fallout 3 and the Fallouts since FO3... They didn't invent Fallout itself in the first place... Hence... A huge hole in this entire theory, which makes me very very skeptical but meh *shrugs*. Doesn't really bother me.
I'd say it's more extremely extremely unlikely rather than call it stupid... But yes I agree just let people have their fun, it isn't hurting anyone.