It could easily take a few years for him to make the team AND get impactful fantasy deployment.
If you're looking for fast (ie next year), I'd be looking elsewhere. Sure it's possible but looking around the league and the way defensemen typically develop its extremely unlikely. Look at guys like dahlin and heiskenen, both have had opportunities this season and they haven't exactly taken off and dominated offensively. Both are more highly regarded than Hughes.
Temper next year's expectations to: Hopefully he plays in the NHL next season and looks like he belongs. If he doesn't then you have to be fine with him developing in the minors.