That’s the next step but it’s so insanely hard to win a major in best of five, Clay is currently his best surface and he ain’t beating Rafa at RG.
Huge win for him over Djokovic though, bringing in Lendl was very astute and is paying off already. Djokovic still the man to beat in 2019 despite the two recent final losses, I think he needs a rest too as he’s played a lot of tennis since going on his run. He’ll be the favourite for the Australian Open.
As for Murray it depends, getting hip surgery is a huge procedure for normal folk let alone someone who competes in such a physical sport at the highest level. By all accounts it went very well but we’ll see how he moves now after ending the season early, he may need to change his game and be more aggressive than be used to be to shorten points. The way he has played for his whole career takes a huge toll on the body, he’ll probably be much more selective with his schedule too.