John Wall made 1.3 3 pointers a game last year at a 35% clip. This idea that he simply cannot shoot and needs no defensive attention outside the restricted area isn't correct. He has improved to the point that he needs to be defended.
John Wall isn't in catch in shoot situations very often due to the amount of time he has with the ball. He shoots only 34% in pull up situations and only 28% on his 3s.
He definitely deserves the Rondo treatment on his jumpers when more than half of his FGA (8.9/16.3) are pull-up jump shots.
John Wall's 35% 3pt percentage is his career high and expecting a dramatic increase to his shooting isn't something to bet on if he retains the same volume.
His playoff shooting is a bit more alarming. Although he faced some of the better defenses in the league, he was still allowed to shoot by the defenses as part of their schemes and Wall's shot was so bad he actually ended up shooting less than his average shooting 22% on his 3s.
Kyrie's playoff stats are to be determined as of now but on his down year shooting the ball he shot better than Wall on a higher volume along with an elite pull up percentage (his catch and shoot numbers were poor this season) in Walls BEST statistical shooting season. John Wall's pull up numbers just aren't very good for someone who handles the ball as much as he does averaging holding the ball for an average of 8 minutes per game (Kyrie averaged 6.2 in comparison).
Kyrie's body of of work shooting the ball and given the trend that shooting tends to return to the norm (some shooters just have bad years numbers-wise due to an inordinate cold streak).
There's a reason why Wall's reputation as a poor shooter hasn't gone away, he just hasn't had enough of a basis to justify buying into his shooting given the situations he is routinely in on this team. He's simply not in enough catch and shoot situations (1.8 FGA compared to 3.3 FGA for Kyrie last season) to help that case.
If John Wall is shooting the ball it is likely pull up, and he isn't a great one at that. Kyrie's numbers were at or near elite in that sense (8.5 FGA with 41% in both total and from 3)
You could worry about Kyrie's shooting off the catch this upcoming season and if last season is an indicator you would be justified, but I believe he's a better shooter than what he showed last season on the catch.
Stats were found on NBA.com