What I see is going to happen is outside forces will dictate what your maintenance is done too. This is already happening for Mine oil and gas type work. For smaller aircraft its going to your insurance company that will or wont insurer your aircraft. On the maintenance side of things a lot of work shops arnt insured for an engine to be ran as on- condition and as such they wont issue a M/R . Right or wrong this is the position that I see happening and is happening.
Cheers