3) The Ontario Line continues West along the Lakeshore - I don't foresee any stations between Parkside and Humber Shores, which is a bit long at 3.5km. I thought about 2 Humber Shore stations, but that would maybe just be inconvenient for the majority of the people. The other thought was a stop at Sunnyside Beach, but again not sure if it's warranted.
The Ontario line take Mimico Creek to get up to the Queensway (there's no other convenient point farther west). Likely 5 stations on Queensway at about 1km spacing - Royal York, Islington, Kipling, East Mall, Sherway.
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Assuming OL is build as planned, with the western terminus at the Exhibition and pointing west while being above ground, that will create a strong push to extend it further west using the LS West rail corridor, and then serve the southern Etobicoke. That's not necessarily the optimal extension, as the north-western options have their merits too, but the ease to build argument will be definitely in favor of continuing west on surface rather than ducking underground and making a relatively sharp turn.