"Never mind whether tolls are a good idea."
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No, they are not. ...
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... unless there is a Downtown Relief Line already completed to Finch.
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But the city and the TTC in their wisdom simply will not entertain the idea of building the obvious, least expensive, and fastest solution to that problem:  Re-build the CP Don Branch, put a cut-and-cover tunnel under the Leaside Spur bike trail, and run double track up the GO line to Richmond Hill.
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Done in no time.
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It would cost pennies on the dollar compared to what they are going to spend taking another 17 years just to reach the Danforth.
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It could be in service while everyone waits for the DRL to the Danforth to be built.
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We need downtown relief to the Danforth, too.  But it is completely unreasonable to expect everybody north of the Danforth to wait another 25 - 30 years for an eye-wateringly expensive line to be built up Don Mills - and even then only to Sheppard, not Finch or Steeles.