Lukaku is surely one decline which is not good news for him while now most chance Roma is not going to keep him with his performance and Chelsea is surely also not needed him which is making things problematic for them, but they have to think about him with no club is going to be interested because injuries are creating problems, and they are having not good time in this season.
Chelsea which is already having serious mess, and they are looking for the better things, but news like Lukaku coming back is surely going to have more bad things for them in transfer window because he is not going to Saudi League and here in UEFA now he is having no good future due to injuries and decline in his performance which is surely no ideal situation.
Lukaku is currently in a difficult condition after reportedly Roma do not intend to make him permanent, so automatically he will return to Chelsea and I think with his current usian and often injured of course Chelsea will no longer use his services next season, Pochettino who seems to prefer young players of course will not need Lukaku in his squad so maybe he will be loaned again or even sold by Chelsea next season, But the problem now is that few clubs are interested in buying Lukaku because the price, release clause and salary are quite high at the moment, so maybe with Lukaku's contract until 2026 of course Chelsea will have to find a way to get rid of Lukaku without having to spend compensation otherwise if they keep Lukaku it will only create a burden for Chelsea because of his high salary.
As you said, of course Lukaku return to Chelsea will only increase Chelsea burden, so it is indeed better for Chelsea to make a deal with Lukaku to part ways, or indeed Chelsea should sell Lukaku as cheaply as possible to another club even though Chelsea have suffered loss but it is still better than having to continue to be burdened with Lukaku in their squad later.
One of Chelsea's mistakes was that they simply paid too high a price for Lukaku and only often loaned Lukaku to other clubs, whereas Chelsea were not aware that Lukaku was getting older and of course there would be very few people wanting to make this player permanent and he would only be a loan player throughout his career.
The next mistake, if Chelsea no longer wanted Lukaku to return to the Premier League, was that since he was still joining Inter Milan, Chelsea should have made a cheaper offer rather than having to keep a player who would never be used as Chelsea's main player.
Furthermore, the mistake that looked most sad when last season Juventus had Inter Milan interested in making Lukaku permanent was that this player secretly talked about a contract with Juventus and Inter felt disappointed and canceled making Lukaku permanent.
Lukaku's future is getting worse as he gets older and I think in the end Lukaku will go to Saudi Arabia.