Or you could do what one normally does, and do a traffic count. Personally I've driven past it many times on the way to work, and I've really not seen much traffic on it.
Quite possible, especially since the parking lots served by the ramp are a long way off (and I'd be really curious to see who would take it coming from the east instead of the driveway closer to Don Mills).
The problem here, is that then the LRT has to interfere with the Leslie/Eglinton traffic. The only place where it would interfere with traffic on Eglinton between Don Mills Road and Weston.
That's is you subscribe to the thought of only limiting the Eglinton line to the underground portion through to Don Mills.
I know the new mayor is all hot for everything being underground (or at least not coming close to interfering with cars, or maybe just not built at all), but I'm just not sold on the expense required to fully grade-separate the line. Building two lanes of LRT down the middle of the street, eliminating left turns (yes, war on cars and all that) and properly functioning signal priority I believe would give close to the speeds capable with the line trenched or otherwise isolated to one side of the road. Of course not everyone believes that.
With respect to putting the lines on the southern lanes of Eglinton, while the lane loss would be the same, I can only think that as a driver, I would be unnerved driving east while seeing a westbound LRT coming towards me on my right. Just like the weird setup with Fleet St and Lakeshore west of Bathurst. In the grand scheme of things, dealing with a three-way intersection at Leslie I don't think has to have much, if any discernible impact on the operation of the LRT. Certainly no more than veering off to the south and then back north again in relatively short order to swerve around the south of the Celestica ramp.