You're correct. The worldwide network was already assumed by 1990. The only question was whether or not it would become mainstream to muggles.

I gained internet access via my midwestern college in 1991. Within a few weeks, I was a regular on a MUD hosted somewhere in Bavaria, chatting (and arguing) with Israelis about middle eastern politics on newsgroups, and had (very slow) shell access on a system in Taipei thanks to a woman there I was flirting with. There was no question this was the future. The only question was: would this be limited to corporations, academia, and interested geeks? Or would this ever hit the general public? Considering the state of the interfaces in 1991, I vaugely remember I assumed it would be geek-only for a while, though I did my part in getting my non-technical friends online. Largely for the selfish reason of wanting them to have email so I didn't have to use the telephone as much.