I don't think so, it's clear that Lukaku's performance has declined significantly in the last few seasons and there are many factors that cause this, including Lukaku's age which is no longer young, so I think he will not be able to perform optimally again like his former glory.
Apart from that, Lukaku is a player that Conte really wants, we don't know for sure why but every coach has his own criteria and perspectives to be able to carry out the tactics he applies.
Players are human and naturally their bodies are affected by time and ageing. No players can avoid problems from ageing and they have to gradually change their playing styles to adapt to ageing too. Lukaku is no longer young and he actually started to feel pressure on his body from ageing but there are other factors can affect his performances such as club support, coach's tactics and teammates support.
Generally Lukaku's performances will be decreasing with time in quality and he will also appear in less matches each season. Conte wants to have Lukaku because they already worked with each other years ago and Lukaku is still useful for Conte and Napoli.
Napoli are now in a slump, we can't compare them to a few seasons ago when they won the Scudetto and for a team that is already in a slump it will not be easy to rise, now Napoli must start from the beginning again in building this team and that will take a long time.
Napoli must be realistic and return to what they used to be like a competitor for top four in Serie A. Chances to win Scudetto again for a club like Napoli are not too big and they will have to wait for several years or even some decades to lift another Scudetto.