I can totally see Metrolinx elevating the line over Leslie Street in the next 4-7 years to provide more reliable service to Science Centre, and to the Ontario Line connection. It's relatively simple, because it would be a short 300m bridge structure, then the rest would be a separated guideway to Don Mills similar to the one built at Black Creek. It would be a relatively simple and effective solution to providing reliable service. The stop at Leslie (Sunnybrook Park) should be removed to be as cost-effective as possible..
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But elevating the entire line in Scarborough, It might be a while (2040), or might not even happen at all. It's simply more time, money and construction. But it should happen... eventually.