It's a fight I'd want to see too, even more than say Wilder/Whyte. Either Wilder gives us another huge KO and watching a guy the size of Joyce go down is always fun or we see a fight unfold like Froch/Groves one with Wilder bouncing huge punches off of Joyce's jaw only for Joyce to walk through it all and stop a flagging Wilder.
Just no way would Wilder fight Joyce ever. Wilder's best form of defence to date has been ducking fights like this.
Wilder was throwing bombs for 12 rounds in the first fight. Not sure where you get the idea he has a bad gas tank. Hell Fury himself has said that only him and USyk have a chance of beating Wilder. Wilder might be a one trick pony, but in this division it's all you seem to need.