Probably wouldn't affect my decision much. Of higher weighting for me is how much of a pain it is to get to the dealer.
Back before cars had brains and told you when it wants service, i used to be pretty consistent in getting oil changed every 5-6,000 km's and did it locally
With the TL the average distance between services is about 10-11,000 km's, so for me that 2-3 times a year. Driving from Guelph to Kitchener is a bit of a pain, moreso lately because i've had 2 unscheduled trips in last 2 months.
For me, having a local dealer will be a fairly high priority in my next buying decision