Whilst I find it threatening to potentially have my access to remote areas limitted due to my physical restrictions, I CAN see some logic in it and have already taken the responsibility of doing so.
I don't want to be that person sitting for days beside a remote piece of single line waiting for a rescue team to walk in / carry me out. There are places where a helicopter retrieval just isn't viable, so next time you blast along your favourite stretch of single line - imagine 4 people carrying your body on a stretcher. Or imagine yourself crawling out.
Ten years ago, I was actively involved in remote area motorbike riding. I had already experienced a difficult extraction from cape york in the wet season, but then I mangled my ankle half way across the simpson dessert and spent 2 days riding out with just one leg that could take my weight. Then 3 years ago I had a relatively minor crash in my own yard that resulted in a helicopter trip ( punctured lung, flail chest , mangled foot) .
Sure, anyone can have a life threatening accident in remote mtb riding - but imagine having to call for a walk in / out medivac because your long term knee injury has just decided to say no.