Linfield aside, the northern teams have fared pretty badly in the Setanta, though there have been a couple of notable results in our favour ie Derry 1-2 Glentoran & Cork 0-1 Portadown
Summer football, and an all-round more professional approach by the EL has given you an enormous advantage over our clubs, but in the event of an AIL then the seasons would run in tandem [obviously] and the northern clubs would be forced to take a similar professional approach.
And - as posted elsewhere - the northern clubs had a slight advantage in UEFA co-efficients prior to the advent of summer football in the south.
Obviously you are streets ahead of the likes of Portadown at the minute, but after a couple of seasons acclimatization, I don't think there'd be the enormous chasm some of you southern dudes imagine.