The problem I see is that Hass creates little separation, except vertically. The Pats tend to prefer quick twitch type guys that create separation vertically as well as via east/west quick routes. I think if you tried to do that with Hass, a lot of NFL saftties will jump those routes on him. Which means double moves (out and up type routes) will be required and I'm not sure Brady has the time to wait on those type routes.
However BB surprises me every year so it's not inconceivable we draft him. Just seems highly improbable.