Best of luck, Gronk, and thanks for everything! Best TE ever!
As for the Pats, yeah, they're gonna have to work hard to come up with a decent offensive plan for this season, as they now have no reliable TE and no big-time receiver outside of Edelman, who's more of a possession receiver. Sony Michel looked pretty good last season, so we might see the Pats become more of a running team, but there's no replacing Gronk.