I don't like the idea.
I think any campus needs to be walking distance to the GO system, and preferably to downtown Barrie as well.
There's actually lots of low density, low value land (relatively) still close to DT Barrie and Allandale. A fairly dense campus can be built on 15 acres or so.
In looking at it, I think I might choose to extend the GO line along the BCRY just to the 400 and put a station there and then build the campus around it.
View attachment 471453
Above: 50 acres, the line on the north (top) is the BCRY, distance to Allandale Stn (following the track from the mid-point of a platform 1.4km)
Distance on foot to Allandale station, 1.2km
Distance to DT Barrie, ~2.9km
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Alternative assembly:
View attachment 471454
More than large enough.
Distance to DT Barrie: ~400M
Distance to Allandale GO: ~ 1.25km
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Edit to add, if one were stuck on the idea of a more suburban location, I still like the idea of using the BCRY to extend GO right to the campus, here's a site just over the 400:
View attachment 471462
In its favour, large site, the southern (bottom) line is the BCRY and could house a GO Station, surrounded by forests, but the western tip of the campus would be on Dunlop which is a straight-shot in downtown Barrie and could see a frequent bus connection.
I still like a more urban location better.