In another interesting THR report on the Han Solo film, the controversy and the problems, I gathered an interesting quote that might hint as something realistically happening, even with Ron Howard now at the director's chair: The use of Chris Miller and Phil Lord's already shot footage.
'How credit will be determined is up to the Directors Guild,' but it seems like what Miller and Lord shot is very much something that can be used by Howard and company. I mean, 90% of the shoot has been completed, you're telling me that they will be re-shooting the entire film from scratch? No way. And, if they do, that would most likely complicate things a lot, set off delays, maybe even lawsuits ...
Here's the exact quote:
"... An insider says much of what Lord and Miller shot will be “very usable.”