I'm mixed about it. Auto dealerships have to go somewhere in cities, and Toronto is one of the last where they're finally shifting away from the suburban template to something more urban. I'd rather Nissan/Infiniti be located in these locations than taking up prime real estate elsewhere with sprawling parking lots and out-of-scale dealership buildings.
That being said, I'm disappointed that Corktown's newest retail strip is going to be dominated by these two car dealerships - though it can be argued that it was the dealerships that likely nailed down the entry of Starbucks into the neighbourhood. Given the difficulty there has been to lease the new retail spaces in 510/549/569 King, there's at least retail anchors, though not the day-to-day kind of retail the neighbourhood would prefer.
I'm optimistic it will come - if not here, then on Queen, and over the next few years as the rest of the condo stock occupies, there will be demand for better retail and the rents to justify it. Auto dealerships are easy to move -- the Mini dealership on King West wasn't around too long before it moved on.