Here is how I see it atm, KI is made slightly less useless compared to SP only once you have taken the Accomplished Doctor talent (increases crit bonus). Even then SP is still the way to go as an emergency heal via Surgical Precision, which causes SP to refund TA when used on targets <30%.
I think adding a hot component would be a nice way to increase SP's value, however I'd prefer they somehow buff it in the tree to toss out an instant heal on multiple targets or something of the sort.