Also, it is now known to be largely made-up, with many of the stories of the book being a certain lie.
In any case, whatever helped kick down Soviet Empire was worth the costs incurred and i think he was one of the greatest figures out of those who made it happen. What matters is that plenty of people read, and believed it. Glasnost created, almost instantly, a critical mass of literature like that, widely available to the Soviet reader, bringing up realisation that the very existence of the nation they lived in, was immoral, unacceptable, and it had to be smashed as soon as possible.
Almost no one really did anything about it, or if they did, it didn't matter. It's just that when USSR started shaking, almost no one was willing to help it.
In Ukraine in 2013, we had Maidan and similarly sized Antimaidan. In 1991 Moscow, there was no Soviet "antimaidan", no one gave a flying fuck about saving the Union anymore. People like Solzhenitsyn were the main if not the only reason why it was the case.