"The fact of the matter is that we are now short of instructors and I can think of at least two guy in my club who would make great instructors.
However with years of safe private flying and aged 50+ they are not going to get a CPL just to get paid a few pounds an hour, but they would do an instructor rating and do a much better job than a spotty youth CPL who spends all his time trying to get a jet job.
It's high time that AOPA and the PFA pushed this point at EASA (if they are not already doing so)"
Well, we're hoping to start by introducing an NPPL FI (SSEA) and a working group is being formed. The concept has been accepted by the NPPL P&SC and by the CAA; however, the devil will be in the detail and we must consider EASA's thoughts for the future European Light Aircraft Licence.
The 'experienced private pilot instructor' such as you describe is precisely what we hope to achieve.
But we must also accept the reality of 'hours builders' and not tar them all with the same brush.