I think the bigger problem is in ethical disposal of serviced parts, especially batteries.
Right-to-repair will also only increase price, since Apple won’t receive serviced parts back to recycle.
It’s a lose-lose. Apple certainly wouldn’t lower any prices on any replacement parts, and would likely charge a premium for toolkits and materials such as adhesives, fresh screws, and literature, not to mention voiding the warranty due to ESD safety issues and unknown variables that would affect manufacturer warrantability.
The only thing that would be a positive impact would be that folks would not have to walk into an Apple store, should they live far from one.