J-15s have to stay relevant in naval warfare.
They have the capabilities to be a strike fighter for many years. However when matched with F/A-18 Super Hornets, it is debatable of who wins.
To catch up, China should implement more electronic warfare on the J-15s, like the Saab Gripen. They can give false radar data forcing enemy aircraft to engage in vision range combat. Destroying long range stealth advantage. Having some aircraft like the Growler on the 001/2 would help too. And I mentioned that upgrading radars to radars not yet invented for planes would be a great R&D task for the J-15s. They have ground radars that can track and destroy stealth at many Kms. These radars need to be miniaturized for PLAN/ PLAAF.
Keeping J-15s relevant keeps 001/2 relevant and extends their usefulness to the PLAN.
001s won't be useless for many years, look at how long we Italians have kept our small light carrier in service with only harriers and helicopters. We know the limitations and use only for strike and ASW.
J-15s would be absolutely useless when they go against US carriers with F-35Cs.
That is why I think that China wont build too many more and will likely focus on a navalised J-35 that can better compete with the F-35C for carrier air warfare.
On the Type-002 we shall see J-15s on a temporary basis before they start to get replaced by J-35. From the Type-003 onwards we shall see only J-35s.