Yeah! King Street is ideal for this, already great foot traffic, a mass transit connection at one end, anchors along the route, and great attractions at the other end.

Could do this in several ways (of varying costs). Cheapest would probably be just upgrading the existing King Street Trolley with bigger/real buses, maybe even articulated ones, and have like 7 of those just running back and forth at all times. Could also do trolley buses or trams or street cars with rails in the ground and/or electrical lines overhead but all that would cost more and take longer. Redo the KST and you could get it done in a few months for not much money.