This is a ridiculous suggestion and won't happen. The volume of air traffic between the two countries is too high to warrant domestic arrivals in the US being processed as international flights.

Just because it took YOU 1.5hrs to clear, doesn't mean the rest of us can't clear faster - in fact, my average at YYZ T3 is usually under 5 minutes for both CBP and security (using Nexus), while T1 can be longer due to the higher volume of passengers waiting to clear security.