The Linx network is primarily intended to connect County communities for education (college/university campus'), healthcare and, to a lesser degree, employment. For example, the Midland/Penetang - Barrie route stops at RVH and Georgian College. If you want to get to Allendale you have to take Barrie transit.
It is a County-funded service and Barrie (along with Orillia) are municipalities separate from the County. Maybe it will someday grow into something more. Maybe someday GTA tourists will be willing to trudge their coolers and floatees from Allendale to Wasaga and back again, but when your primary source of income is property taxes, options are limited.