It's completely backwards, and I believe it's being presented as a subversive political move to eventually kill the Scarb Subway. Look at Stouffville GO / SmartTrack, and its 2km stop spacing through Scarb. It's a commuter line, yet it's now being given a rapid transit amount of stations. Whereas an actual rapid transit line is being extended as a commuter line with one station. That doesn't make any sense.
I'm not even sure how Stouffville GO got shortlisted for electrification, considering its 2010 business case and ridership as AD2W was less than stellar. There were no plans for electrification here less than two years ago. Now they expect us to improve upon it even more by having it become both electrified RER and a local-service metro system of sorts. It's odd, and doesn't add up.