Parts definitely seem to be a problem. Happy to have my Roadster back today after a 5 week repair job, most of that time being waiting on parts. On the other hand, got my first experience with the loaner program, so I actually was given two different loaner Roadster to get me through my hardship. As a new Roadster owner, it was great to get to spend some quality time in not just one, but two different vehicles to establish a good baseline for how my feels, "is that noise normal?", etc.
Not sure there is any answer that makes direct financial sense, but I strongly feel that Tesla really, really, really needs to take care of the Roadster owners. Not because I am one now, but for the original crew who took the risks back then so that we have a company there now. One of the things that was key to me during my 13 month wait for our Model S (which was costing about triple the previously most expensive car I had bought), was reading how well taken care of the Roadster owner seemed to feel, and the fact that so many seemed to be on the Model S waiting list too. So I think it's critical that these earliest of adopters are taken care of and there is not a left behind bad taste in their mouths. There are thousands and thousands of future potential sales that will look at the this as I did. Tesla can't have people worried that they and their S or X will be abandoned once Tesla's attention is consumed by producing hundreds of thousands of different technology Gen III's. Each future car generation will be reliant on the goodwill of the previous generation.
So once again, thanks to all the original Roadster owners, I hope that when all is said and done, you'll feel 100% that Tesla stuck with you and did you right.
P.s. Is that car a blast or what? I'm really jealous that you've been enjoying this for years.