I think "sci fi" is totally established instead of sf. At the Popular Culture conference, someone who is mainly in film but did a great paper on Kit Reed's novel Thinner Than Thou used "sci fi" and, when I asked her about it, said her colleagues use the term all the time.
In th8is case, I'd guess the phrase in question meant that Silverberg didn't quite make mainstream literary acceptance.
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In th8is case, I'd guess the phrase in question meant that Silverberg didn't quite make mainstream literary acceptance.