* "Busiest highway in North America" - that's because the Provicne built one big freeway rather than carve up the city with lots of smaller ones. Or do you want the GTA to look like Mississauga?
* "pays half the property taxes compared to most of Ontario." That's true for residential... Toronto gets by far the highest percentage of its revenue from non-residential sources, precisely because it is a popular place to do business. So it has lower residential tax rates. 
* " Holds most of the provincial seats." It's more like half, because the GTA has half the population. 
* "Toronto should adopt market value assessments" it already does - that's how property taxes work in Ontario
* "building permit moratorium for 10 years" - how will that help? Unless you want businesses to move elsewhere because they can't expand or recruit.
* "How about in North Bay or the Sault?" - lovely places both, but have only 1% of the population of the GTA and hence only 1% of the number of available workers.