Actually there's a working theory that Scottish football would breatly benefit from Rangers not being in it - given that they cheated their way to wnning titles by "buying" and paying for players they could only afford by withholding tax payments from HMRC.
Unlike the EPL, Celtic & Ranger demand sometbhing like 80% of the TV revenue, so add that to living beyond financial means and it's understandable that other teams couldn't keep up with them.
In Rangers quest for greater European glory, they regularly raided other Scottish teams for all their "good" players and brought in highly paid foreign player.
The point has been made that the last time Rangers were also-rans in Scottish football, Scotland had a reasonable national team and performed relatively well in Europe. The older heads on here might remember the time when the likes of Aberdeen & Dundee Utd had half decent sides and did well in Europe.
I think generally, quite a few fans of Scottish teams would tell you that England would be welcome to them and right now it seems more truthful that Rangers FC need Scottish football more that it needs them, because without the concent of the SPL's other charimen Rangers will have to start in Division 3 of the Scottish League.
Mind you there's no guarantee that the SFA won't suspend them completely for bringing the game in to dispute for at least a year.