Interesting theory. Raiders and 49ers won when I was 8-9. Liked Jim Plunkett, thought Joe Montana was about as cool as you could get. Didn't latch onto either team though, somehow I decided I liked the Browns. I watched the AFC Championship and The Drive in a hotel somewhere in eastern Ohio, which established an enduring distaste for the Broncos and hatred for Elway (and rejoiced as he got repeatedly pounded in SBs in 87, 88, and 90). Didn't really pick a team until the peak 49ers years, and stuck with them for a solid decade, until Steve Young hung it up.
Kind of drifted away from NFL after that. I'd watch the SUper Bowl, but in a lot of seasons that's the only game I saw. Watched the rise of the Seahawks as my de facto "home" team, but wasn't invested in it. I'm still really not, although my interest in the NFL has been rising lately as my interest in CFB wanes. Haven't picked a team yet though. Someone needs to give Minshew a starting job so I can have someone to root for.