I suspect this question is best answered by your son's coach (and whether he needs a blade upgrade at this point).
I was expecting this answer, I was trying to keep the post short and to the point, but I will provide some more details to explain my question. Long post- sorry.
My sons coach is a very accomplished player and coach. She is one of the top rated players. Apparently she was a provincial player in China several yrs back, she attended a TT school etc. Even now she spends a lot of time in China (atleast 6m in a yr) coaching/training/playing. There is however a communication barrier as she speaks limited English so we don't really talk a lot.
At this time my son is very comfortable with his setup and probably play with it for another 6-12 months. He is only 9 yrs old and can't give much input about the equipment. The reason I am asking this question is I play TT as well and I consider myself an intermediate player. I have not played and rated matches, for that matter I have not played in 17 yrs other than a game here or there. Now I play with my son - mainly practice, not much games. When I started training and playing with him I bought myself a Gambler entrylevel setup ( silver dragon with Zero rubbers). When the rubbers got old in 3-5months I was looking to change them. Then one day I was playing a match with one of my friends who is a decent player I was doing very badly so I borrowed my sons racket and noticed the difference. It was day and night difference, even the Xiom rubbers were still playing very well after 10 months, so I decided I should switch to his setup and whenever I got chance I would play with it. I realized it is very good but maybe a little slow. I was advised last yr on this thread that maybe I should buy the exact setup as my son which could be a back up for him if he needs it. I should have listened to that advise, I am not too concerned about myself.
I want to start playing with the next step up for him so that I can help him decide and figure out the characteristics of the upgrade, and then he will have his backup too. At this level I don't want to spend a lot of money and I dont believe in "EJing" specially when I have all the experts here whom I trust a lot. Thats it for now. Thanks for all the great advise.