I guess I had never seen Ian's note on the skid-guards for the 2.5 front end, so pardon the one-year delay in responding, but yes, Elie did install skid guards on my 2.5 front end. I can happily also relay that I have taken a few scrapes on the front and I haven't touched my 2.5 front bumper, but instead only scraped the skid-guards.
As to the question of upgrades that would engage the Roadster-owner's soul, I second (or third, or fourth...) the proposal for a battery pack/PEM/drive upgrade. I have gotten all the CF and appearance-related upgrades I desire. That said, the company's focus now appears to be Model S/X, and I don't blame them for that. They are in my opinion doing a good job of executing on that which is mission critical. Indulging their early adopters would be nice, but not really in shareholders' best interest. Even once they are able to pull some resources away from Model S/X, I expect those to be assigned to Gen III.
If it were easy to develop a better battery pack for the Roadster, then sure, do it. I'd love it. But you know it would cost an arm and a leg and the other arm and the other leg. You'd be the black knight, driving the Roadster - "Come back here! I'll bite your knees off!"
So will it happen? I'm certainly not qualified to opine on that. Certainly there is a germ of an idea there, given that they have found a way to develop a seemingly superior battery pack and PEM combo for the Model S. But is that able to be implemented in a retro-fit for the Roadster, which is much smaller and can't really use a skateboard? Maybe others more knowledgeable can shed some insight.
All that said, I've seen at least one person (PRJIM) who seems to think that Roadster almost all owners are bailing on their Roadsters to get a Model S. And happily, I have seen others chime in and say that is a load of crap. Well add me to that crew, because even without upgrades I love my Roadster, and I have zero interest in getting rid of it for a Model S. The cars are SO different, and I am just not a candidate for a car that large. Can't see out of it, can't park it in public or in many garages, and it is nowhere near as nimble as the Roadster. So if upgrades come along, great. If not, that's fine too. I admit concern about going out of warranty, but I am currently willing to go there (self-insure) as there is no other car for which I would want to trade in my Roadster. Not even close.
Maybe if I win the lottery and the "production" version of the Concept One isn't quite the size of the Model S/Panamera/Karma/7-Series/Land Rover... Now THAT would engage my soul!