I know what you mean, but for me, the "solo" part is not important. The fact that he went from creating such a prolific body of work, to near death and back is enough.
For my birthday a while back, my wife brought me to the Red River theater in Concord, NH to see Love and Mercy. She is a casual Beach Boys fan and is very familiar with the hits but she was so touched by the story that she could not even look at Paul Giamatti without saying how much she hated him (as Dr. Landy).
Seeing Brian's life prompted quite a few questions and she now listens to some of Brian's solo stuff (she really likes One Kind of Love). Knowing what he went through when you hear some of their music makes it even more emotional.
If Brian went through everything without the bad times, what he accomplished would still be amazing. The fact that he struggled to come back from the depths of hell make it a far more compelling story.
Good points and comments. It is impossible in 2017 to overstate how much of a shock it was to hear the announcement in 1999 that Brian Wilson would be touring and playing live. It was actually the impossible becoming reality, and I think that was as overwhelming to most in the audiences in that first run of live shows as it was to me. After they ran the short video intro, there was audio of Brian running a studio session in the 60's, and boom...then there he was on stage. It was absolutely the impossible becoming a reality. And it was credit to the man's "will" as he likes to say "I'm a Wilson!" that he was on that stage performing after nearly everyone counted him out not too long before that tour. And then there we were again in 2005 watching Smile performed live on stage.
Keep in mind, up to a certain year no one thought anything like this would ever happen or if he would even be alive and well, and that Brian would simply retire and drop off the radar. He's still going in 2017. Tell me THAT isn't inspirational on any level you can think of.