As was said above, turkeys won't vote for xmas. Maybe the most likely change is SPL 2.
I've lived through an 18 team league and I'd love it to come back, or at least 16, but I can't see the middle sized clubs ever agreeing to give up their 4 games v the OF. Shame as the game is slowly dying in this country.
Can't compare it with England either. Population is too sparse - clubs can bankrupt themselves with travelling to play in front of a few hundred. Just look at the early rounds of the Scottish to see that.
The first time I went to a baseball match over the pond I saw what would happen here 10 years later. A top layer of mega clubs in the Champions league, getting richer and richer on the TV money and selling the jerseys worldwide, then just below, all the others, skint.