Ah well...that answers my question anyway.
Strange how the AC could operate jets (with the inherent maintenance costs, higher fuel bills, etc) in a display team in the '80's - when there was even less money in the the country - and nowadays they not even allowed to use their turboprops for the same purpose?!
Indeed many would say that an AC display team would be a great promotional tool for the country in the current economic climate.
(Ironically, if a few PC-9's do go into storage...it may leave them free for use by any (part-time/volunteer, as was the Silver Swallows) display team to use?!)
We may live in hope I suppose!