I was just looking at some old posts on here back in 2013, when we all dreamed of $1,000. Anyone talking about $10,000 was seen as a nut-job, in much the same way as anyone now talking of $100,000. Crazy indeed.

Yep. Us permabulls back then were confident that $10k/btc would be reached and exceeded someday. We just didn't know when. The 2014-15 downturn was a temporary setback, but it just created a longer, faster ramp.
I'm more than confident that $100k/btc will be also be reached and exceeded one day. Again, it's just the timing that is the unknown. I'm guessing within 5 years max. I don't see that as being an unreasonable amount of time. There will need to be 100M+ adopters worldwide for that to be supported properly, though.