Viggen
Just here...
It's not very difficult to get rid of all of the electronics on a D1. The largest stumbling block is location dependent for the OBDII versions, as you can be limited to engine choices and that can impact what electronics you can get rid of.
Where I live I could get rid of them all in my 95 Disovery.
The "average" owner won't be keeping their cars long, or are unlikely to be buying a used Discovery anyway at the point when the OEM or pattern part fuel pump is NLA. That means more parts vehicles for those of us who do keep them.
My largest concern is things like window seals. Things like that you can't really get used.
I too have a 95 but there is a pretty good amount of electronics in there that aggravates me sometimes. OBDI trucks were two years only, 94/ 95 and those are very hard to find as most have rusted into the ground. That leaves you with only OBDII 1996 and newer trucks to play with and then you open up the BIG electronics nightmare and the can of worms where any change to the system results in an automatic fail of state inspection. That means no repower options really without some SERIOUS wiring.
True, the "average" owner will be getting rid of their truck at the first hint of hardship, Craigslist is the shining example of that. Needs a head gasket: $500 on the 'list. Look at the OP as another example. Hes looking to get into Rovers because they are cheap. The problem is, most Rover owners are "average." The amount of us who love the trucks and all their eccentricities is a slimming number. With "average" owners drying up, so does the likelihood of aftermarket, non oem manufacturers picking up the call for parts will not happen. Less on the road, less demand, less parts.