As a City fan, that season was great. I went to a lot of away games and the grounds were all full, every game a big occasion. So I get your question of what level they would come in, but then the question would become how high they could go? If Premiership clubs blocked them getting that high, as I believe they would as stated above, that blocks Europe.. and money. And in that case I think they'd stay in Scotland. Maybe go to Holland? Small league there.