I took a look at my records.. MTO did plan for a new north bridge after all, actually.
This was last looked at as far as I am aware in the Niagara-GTA study, which looked at long term transportation capacity for Niagara and the west GTA. Among a bunch of other things, it projected then need to widen the Skyway.. With a widening of the south bridge and a new north bridge and a total of 16 (!!) lanes.
This was the only image provided:
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It also included some upgrades at the RHVP and QEW interchanges..
and a widening of the 403 through Hamilton:
A lot of the work identified in the study (403 widening through Burlington, Freeman Interchange upgrades, twinning of the Garden City Skyway, 403/QEW interchange in Oakville upgrades) have had environmental assessments complete or are underway, and will likely get built in the next few years. So MTO seems to be working it's way down the priority list of the projects identified in the study, and one of them was widening the skyway.