In reply to Mark Sheridan:
I've been mulling the 'James Pearson Grade Backlash' problem for a while, and it reminded me of a couple of things that immediately jarred when I first saw them:
1. Firstly the caption: "The Promise: England's hardest trad route", immediately made me think "Really? I mean Really?". Given that it's so short, and Superstition, only metres away is unrepeated (I think), and there are those wacky hard cornish routes, and Rhapsody and etc. etc. etc.
2. The claim that "The Walk of Life is without peer in terms of difficulty, danger etc. etc.". I know that this wasn't said by Pearson and was subsequently retracted, but coming only days after the Echo Wall FA was a rather silly thing for a media savvy climber to have associated with them.
My point, I suppose, is that this sort of thing tends to needle people, so they are less inclined to shrug and ignore when the routes are subsequently downgraded. If, on the other hand, you say "The Promise: my hardest climb/greatest achievement to date", then everyone just says "crikey, this guy is good, so this route must be something else", in much the way the DM's routes have been reported/received.
I don't know any of the protagonists, but a very distantly removed perspective has just cast the impression of someone setting themself up for a fall, which has indeed happened.