...however, looking at points gained over previous highs it appears that sentiment can only remain in the driving seat for a certain distance before markets gravitate towards fair value.
By this - are you referring to the most recent times the market made ATHs and corrected shortly after?
Regardless, the opposite have happened as well. If we look at September 2017, the market actually followed this sequence after making ATHs:
1) 7 consecutive weeks each making ATHs
2) 1 week down -0,10 % and no ATH
3) 5 new consecutive weeks making ATHs towards year end
4) Last week of 2017 down -0,42 % with no ATH
5) 4 new consecutive weeks each making ATHs at the start of 2018
For a total gain of 411,25 points or a 16,51 % gain. So, pretty much 16 weeks of ATHs with only two small pauses in between.
Then, of course, the markets went down top to bottom 343,25 points over the next two weeks.
