That's a difficult one. Chelsea's net worth is just under £2Bn. I believe RA has sunk more than that into the club to get them where they are now. He's tried to set the club up to be self sustaining, but he keeps having to sink more money in to keep them relevant. In 2019, RA put a further £247M into the club, but they still posted a loss of nearly £100M for that year. 2020 they made a £35M profit, but that was likely down to winning the CL. Even so, unless they are going deep in Europe, and winning the PL, they bleed money.
I think it's unlikely that any prospective buyer would look at their accounts and see an entity that would make them money, especially after having to shell out nigh on £2Bn just to buy the club. Even if he sold it at a loss, you still have the fact that, unless they are constantly successful, winning major honours every season, they will lose money.
Compare them to us. We have a very easily managed debt, an infrastructure designed to make money, which has seen our revenue outstrip theirs without the NEED for constant major honours, and we'd cost the same. There is value in investing in THFC because we're not reliant on the owner regularly having to dip into his own pockets to keep us relevant.
So, based on the above, I'd say they would be in proper Barney if he left them and they weren't bought by another multi billionaire looking to spend his/her money on an expensive toy.