I was gonna say that you don't even have to widen the road .
In some places along Eglinton, you're right. Imagine that, BRT for the cost of a few buckets of paint.
Having grown up in Ottawa, I've seen the advantages and the disadavantages of BRT. In the more suburban areas of Ottawa, it works great. Woodroffe Ave south of Baseline has dedicated lane BRT for about a 2km stretch, and it's in several other places in the city. The main reason why BRT is being phased out in Ottawa is the limitations of the at-grade portion through downtown.
A definite advantage of BRT which you don't get with LRT is the ability for other bus routes to use the dedicated bus lanes for part of the route. This would be useful on Eglinton, which has several bus routes running on it. No doubt that Eglinton-Don Mills and Eglinton Flats stations would become pretty significant bus hubs, and these lanes might be useful for feeder routes on their way to the stations.