Last thing first, there is no sense to a 'streetcar' here, as in mixed traffic.
To what purpose?
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In terms of grade separation to get the cost down to 4 Billiion and change the current design nixed the one full grade separation in the plan, at the Kingston/Morningside intersection.
Other than scrapping the concept out right, full grade separation would be mean tunneled stations at every intersection. That would more than double the budget.
Again, there is a need for better rapid transit in eastern Scarborough, the current concept is not that answer; nor do I think the political will is there to stick to the current route at double or triple the cost; and it probably shouldn't be either.
We need to separate out the idea of better transit on Eglinton East/Kingston Road from better transit to UTSC and/or Malvern. I don't think they are or should be the same project.