Scottish clubs and the national team need to start winning Euro tropies again, getting to the latter stages of every competition on a regular basis, winning more games etc, etc to increase the country and club coefficients.
Unless this happens the Scottish club sides will always be starting their Euro adventures in June and July when all the teams from the good leagues are still on the beach sunning themselves.
So for me playing winter or summer will make no difference if our teams are continually shite and failing to progress beyond the diddy team rounds.