Hm... conceptually, I wouldn't mind Spidey sharing a universe with other superheroes, but I think that that should be seeded from the start. I guess one could say
ASM precedes
Thor, and thus could fit into the MCU without too much trouble, but that begs the question of where Spidey was during the Chitauri attack. (In bed, with a feverish case of Spider-flu?)
As other have said in the other thread, I doubt there'll be any significant integration beyond maybe a building cameo in
ASM2. If
ASM3 were to open with a montage of fever-wracked Peter watching the
Avengers carnage on TV... that
might work? We'll see how the rights things go.