I think you're right on the money here with this logic. The presentation of the incredibly outrageously expensive option as "Doug Ford's preferred solution" will make a bunch of other smaller (but still very expensive) projects or alternatives seem much more palatable to both politicians and the general public, whether intentional or not. The 401 is ultimately a very complicated problem that requires projects in both the rail and road spaces to alleviate. Fortunately, we have a few in the pipeline already that might help. I see the following projects (either proposed or fictional/potential) all in conjunction being able to help ease the 401 to varying degrees. Combined, this could likely cost more than the tunnel, but would be better for the overall transportation network in the long-term due to redundancy:
- Line 4 Sheppard East/West Extensions to Downsview/Scarborough - provides a parallel east-west transit redundancy alongside the 401 from Allen Road to McCowan Road.
- Line 5 Eglinton West/North Extensions to Mississauga City Centre and Pearson - would provide an additional east-west transit redundancy alongside the 401 from Hurontario into the rest of Line 5, as well as allowing greater use of transit for airport traffic.
- Line 6 Finch South Extension to Pearson - would connect Pearson to the existing Line 6 alignment, which itself would tie into the extended Line 4.
- Midtown GO Corridor - is kind of far away from the 401, but it would provide a much faster through option to make east-west travel on GO faster. Would likely be one of the most effective if improved with a similar scope to OnCorr.
- The Missing Link - goes in conjunction with the Midtown GO corridor, would allow some more freight to be shipped by rail due to improved routing, and would subsequently free up the Midtown corridor for east-west trains.
- Highway 413 - would be able to divert some vehicle traffic away from the crucial chokepoints at the 401/427 and 401/400, especially for travel going north from the western GTA.
- Bradford Bypass - similar to the 413 but to a lesser extent, would be able to provide an alternative route toward the 400 for travel going north from the eastern GTA. Still would result in heavy traffic direction toward 401/404 though.
- Buy Out Segments of the 407 - purchasing out some segments of the 407 ETR lease and incorporating it into the provincial 407 tolling scheme (which is cheaper), allowing for some additional diversion from the 401.
The key seems to be redundancy; such as making east-west rail and transit travel through the GTA more palatable, as well as diverting traffic from some of the big chokepoints on the 401.