Nice to have a well balanced and enlightened view from a new ppruner - Rivet Joint - don't see that spending a lot of time and effort upgrading the avionics is "running them into the ground".
And why good riddance to them - isn't that a bit harsh? They have been serving the islands for 40 years and still doing a pretty good job by the looks of things.
The GPS (Garmin 430) is in 2 a/c and the other 4 will have the latest Garmin 750 fitted - which will then be fitted to the first 2 in order to standardise the fleet.
Also in the pipeline is the fitting of an EHSI and EADI.
All of this will bring them in line with the latest regs - as i said before, hardly running them into the ground.
Some people say if you have nothing good to say then say nothing. You could try this maybe?