Obviously there would be more game postponed in the winter months than summer.
Also, summer football is brought up at least once a year for many a year. My guess is the SFA, SPL, SFL, SPFL have brought up the conversation with broadcasters and obviously the money on offer wasn't worth the upheaval. Would our leagues really bring in that much viewers on sky/BT when the World Cup/Euros/New Nations League is over free on BBC/ITV for them to throw more money at us than we are getting now. Probably not.
My point was that any time a Scottish team is beaten by an unfancied team in Europe, we immediately run to the answer of Summer football, when it really won't change much in the long run.