Incorrect. Used Skylines, especially Korean ones from the 2000s/early 2010s, have retained their value on the used market quite well. Comparable with new.
Some Lakland USA parts are interchangeable with Skyline parts, but not necks or bodies. Not sure what you'd have to do to the bass to warrant 'replacing parts', but Lakland makes replacement tuners, etc readily available for most all of their instruments. I was a Lakland Artist for many years and they are one of the best at going out of their way to make something right, and available, if a customer is in need.
As far as the construction and tone of the -01 series, I call bee ess on the notion that the stock electronics (and tones) suck and warrant gutting the instrument from the get-go. All of my 2000s era Korean made -01's have their stock Bartolini MK-1 electronics and I've recorded and performed hundreds of hours and shows with them with great results. The preamp is a little sizzly on top with extreme boosting, but overall you can get very usable, albeit mostly 'modern' sounds out of it as a general rule.... you won't get a tone that will fool anyone for being a Jazz Bass, Precision, or even EBMM. But it has a great tone for what it is. I also have a 44-02 Deluxe with the LH-3 USA electronics package. While it is very different tonally, it's not necessarily 'better' in all instances.... it sounds like a totally different instrument. I still go to my -01 series basses a lot even though I have the -02. FWIW, a Lakland and a Fender Jazz (especially depending on neck profile), balance, play, and feel very different when compared with each other.
In general, the market perception of the Fender will ensure that it will retain its value and likely be easier to resell in the future. But the Skylines, especially the Korean ones, are solid instruments that last.