If the tech is there for a man portable laser to seriously burn a person or make holes in surfaces without armor from 100-200 m away, why not rather utilize that tech for a 500 kg laser on a vehicle, to kill a person from 300-500 m away? Or does it not scale that way? With computer aided target tracking and no probability of miss, fire from a stable platform such as a vehicle could virtually guarantee a kill every time an enemy soldier is detected, even if for just a few seconds. Even aiming at just the head should be doable, since there is no chance to miss. A battery offering just a few hundred of such shots should be enough, if made modular enough to be replaced within minutes.
Before that can be ever achieved, we did be seeing tank gun's being replaced with lasers. cannons This is one of those ridiculous bandwagon, flavour of the month esque things. The USAF starts some highly doubtful claims of slapping on lasers on the F-35, and then all of a sudden everyone and their family dog starts thinking that that's a feasible idea.The powerplants are still too massive. Not sure how much of it is diesel / gasoline generators; though, if the power unit can be made compact enough, you can slap it on a J-20 pod installed into the short-range missile bay.