It would certainly be unpopular w/those who have turned cottages into investment properties. I'm ok w/being unpopular w/this group, just as I am w/investors buying unlivable 'boxes' in Toronto and Vancouver, pre-construction for the purpose of flipping, or even renting.
The very act of short-term rental is a disruption of the normative market.
Let be clear, the cottage-ownership class in Muskoka is now quite an elite group and a very small portion of the voting public.
Preventing properties from being used this way would likely force large scale sales, which would depress the market price substantially, and in turn make cottage ownership more accessible to more families.
Even those taking advantage of STRs are generally very well heeled, prices are often quite steep relative to traditional hotels, never mind camping.
Zero sympathy from me for what I see as sociopathic market manipulators who have monopolized properties and inflated the cost of cottaging beyond the typical middle income family.