It can be changed if the SPFL, HL, LL and SFA all agree. Which of those would be strongly opposed? I suspect the HL don't want any Tayside teams, so they would be no problem. RP not knowing is probably indicative that the SFA and SPFL won't really hugely care either way, so it probably all boils down to the attitude of the LL and there being an even larger population imbalance between the two feeders may tip it the other way. Probably difficult to change but not impossible.