Wow, never thought that day would come. The solution is simple enough - tear down the tangle of wires and signals for the reversible middle lane, and replace it with a green median, perhaps featuring a bike bath. This would restore Jarvis to Boulevard status while providing a decent N-S bike route from Bloor to the water. The cars will survive just fine without their extra lane.

I think the bike bath isn't such a bad idea.

I recall hearing once Kyle Rae expressing a desire to remake Jarvis, but saying he'd have a heck-of-a-fight from his Rosedale constituants on his hands who see it as their traffic pipe down to the Gardiner.

Which I have never really understood. Jarvis consistently looks like an unpleasant street to drive on, always backed up.

apparently there's a push to get bike lanes included though I tend to agree that Sherbourne's okay/close though it desperately needs repaving which I've bugged Mr. Rae about - instead of the BYBIA Bloor rebuild. Or fix the area bike lanes first ahead of this 1km.
But if 50 folks ask about bike lanes, they'll look at it. Looking at it isn't doing it of course, we're to think that merely providing the extra width for bike lanes eventually is good enough while the ice caps melt.