I think Chelsea set a selling price too high for Lukaku which in the end was very difficult for Inter to accept. Lukaku is still good, but I don't think his value is higher than 30 million euros, but Chelsea want Inter to pay more. Loan options are being discussed, but it seems Chelsea just want to sell rather than put him on loan again.
Inter have so far not looked like they are going to force Lukaku's transfer at the value asked by Chelsea, that's because Inter seem to want to save a lot of money for other plans. Chelsea had to make a tough decision about Lukaku but I think 30 million euros is a good value for a 30 year old striker.
Ofcourse Inter Milan will be reluctant to buy the Chelsea man who is past his prime years for £30 million. Such amount for a 30 year old isn’t common, the fact that Chelsea prefer to sell him permanently rather than accepting a loan will make it even difficult to strike a deal. Somehow they will have to find a way around the transfer fee, Chelsea will have to reduce the fee for Inter Milan to get the player this summer.
Chelsea do not want to be disadvantaged by their previous transfers and this is even reinforced because Inter tried to borrow and it was rejected because they really want to release Lukaku at this time.
30 million is like a fixed price now if Inter can afford it then do it but if not then this is difficult to happen.
But on the other hand at the moment Inter also have serious talks about Onana with Manchester United.
Currently Manchester United's goalkeeping position is vacant and it seems possible for them to bring Onana with a 50 million + clause possible and that means if they really want to make Lukaku permanent Chelsea will be happy to wait for it.