Was walking by recently and thought it would be possible to make the area around St Lawrence a pretty incredible experience due to the oversized median (not unlike the University Ave Park concept). Pedestrianize Wellington (edit: actually meant the westbound lanes of Front St) from Church to Jarvis, and include the oversized median that exists there currently. Make the existing eastbound section of Front St two-way (one lane each way, keep the parking spots for drop-offs), with westbound traffic switching to Wellington at the Church intersection.
I'm sure there's some logistics to it but...one can dream.
@DSC made some useful points above.
I would say the following.
1) I think it is realistic that, one EB lane on Front from Yonge to Church will be removed in the medium term, and given over to widening the south sidewalk.
This is important for the area you're discussing because we need to consider how much traffic is funneling to the section in question.
2)Shifting WB traffic from Jarvis to Church onto what is now part of the EB ROW is theoretically feasible, but problematic. The key issues would be how you line up Front from east of Jarvis to allow that movement w/o interfering with left turns on both sides of that intersection; then in turn, the problems that occur at the other end in misalignment with Wellington. I would also contend that the sidewalk on the south side of Front, from Church to Jarvis would derive considerably more benefit from widening than the north, except for the Market Street/Lane to Jarvis section.
3) From Market to Church, I believe removing parking and all but one lane of through traffic is realistic, though left hand turn lanes at both Church and Jarvis will likely need extending with the pedestrianzation of Market Street and Scott Street.
4) Market to Jarvis really does need sidewalk widening, especially in front of the North Market, but the South Market as well. Here, I think removing the tree-less section of median, which is quite narrow, would be useful. I don't believe an EB lane can be removed on approach to the intersection, but I think a WB lane could. Assuming that were true, there would be ~3.5-5.5M available to widen the sidewalks which would considerably improve their safety and comfort and might even allow for a couple of trees.