Alright then Mick, lets talk about these 'cheap non-franchised parts' you mentioned above.
Log-on to Cousins, search for Omega movement parts and the 565 is the first on the list, presumably because that's the caliber they sell most parts for. 5-6 years ago they had almost every part available, and now around 30% of them (I CBA counting them all) are 'restricted by manufacturer'. Out of the over 100 parts listed a grand total of three are generic or aftermarket; a stem, a mainspring and a setting lever spring, so if a dubious watchmaker wanted to cheap-out on parts he doesn't have many avenues.
Now lets look at Rolex to see what their long standing parts restriction has done regarding non-original parts. Search Cousins for Rolex parts and generic even has it own section with
44 different categories contained within, so it's never been easier for some charlatan to take liberties when servicing a Rolex*.
Independents won't need to worry too much as genuine parts will still filter through to Ebay etc like you see with Rolex, it's just that they'll likely cost more than they currently do and watches could be sitting for a long time waiting for the right part to appear.
*You'll say that a Rolex should only be serviced by Rolex and in most cases I agree,
but if you own an old Constellation that's worth a grand tops and because it's vintage you might get billed the same again, then you should be able to see why someone would opt for the cheaper independent option vs throwing it in a drawer. The cheaper option will always be there, it's just that it'll become more likely that generic parts may have used when the vast majority of independents would prefer to use genuine, and that benefits no one.