I'm sure the Army will retain Land Rover for second echelon back up.
As for unreliable, that was not my experience of them. During an exercise in Germany I drove a petrol SWB LR untility truck for 4 days with very little engine oil due to an 'oversight' in on base servicing.
By the time the exercise was over, the engine would gently stop running on idle. Once I put the oil into the engine, it continued to give sterling service for atleast another 70,000 miles that I know of, as I was evetually posted.
I've driven hundreds of thousands of miles in Land Rover's without any Major Malfunction, and thank the Good Lord as Major Malfunction turned out to be gay.
'G' - For Freedom, Justice and.... the other one.....