Will other coaches try telling recruits "you don't want to go to UConn, Hurley's leaving for the NBA as soon as the right franchise makes an offer."? Of course they will, negative recruiting has been around for as long as recruiting has been around. This shouldn't have much more impact than any other line coaches have tried over the past couple years.
There are a couple methods to combating this specific topic when other coaches try to use it to influence recruits against us:
1 - The head coach can be honest and straightforward, using a history of integrity to convince the recruit that regardless of what happens he will be upfront with everyone. The way Dan Hurley has pretty much handled everything so far.
2 - The head coach can take the sleazy, used car salesman approach, telling everyone what he thinks they want to hear, believing that selling BS that you have no real intention of honoring is the way to do things; kind of like Pitino and Calipari.
For either to work, the person employing the methodology has to be able to do so while remaining himself for it to work. Fortunately for the three examples I mentioned each can take the approach I linked then to while remaining themselves.