One reason I want to see all types of AVGAS disappear is that the market in the US, let alone Oz is too small to justify the infrastructure costs of making it available. You have Jet-A, and associated stuff to get it too the bowser, trucks etc. Then you have another fuel, AVGAS, that must be carefuly handled, separated, trucks, tanks, lines etc, duplicated infrastructure. That's not even talking about the refining costs.
Mush better I say to have the one fuel, Jet-A for everything that flies.
I cant work out why we have 3 different grades of fuel for cars. 91, 95 & 98. Why cant they just standardise on 98 and take the advantage of economies of scale.