I am in favour of larger divisions with decent promotion relegation possibilities.
Two divisions with regional below that seems popular, but could not be enacted 2012/13 season (any changes would be diffcult for 2012/13) as some teams would be relegated without the opportunity to compete.
The worry with newco going to the bottom tier seems to be financial meltdown.
I am only throwing the following in for discussion but if the bottom tier for 2012/13 was the second tier?
Suppose two division for 2012/13. size 20/22. At the end of the season 4 down (or whatever) and 2 up. Then we have a top tier of 18 for 2013/14. The relegated clubs + the top 14 make the second tier. Below that regional.
Future promotion relegation first to second 3 up 3 down (could include a play off) second tier to regional not sure.
Just a thought as I wait for the SPL vote!