Specifically on this improvement they were looking at making the top of the Stardust (aligning with the airstem) more stable so that there is more likely a good, true seal created. They really, really don't mind modders to extend the life of the unit because they are smart enough to know that the word gets out and their purchasing base grows and nothing lasts forever, when the modder absolutely needs more product they will return. They also know that people buy these in multiple amounts to sometimes have extra for various juices and a supply there at all times for when they haven't had time to clean and disassemble. (this is written also for benefit of lurking readers from friendly vaping production environment)
We've conveyed to them the idea, to make, especially something like this, where we have to charge a higher price per, completely accessible to maintenance at the user's discretion.
Now my thoughts on making the base threaded. I am not crazy about that idea myself. It introduces more variables into the what-might-go-wrong scenario. First you could have faulty threading at the factory causing cross-threading. You have factory workers getting frustrated and under the gun with production quotas who would force the unit into the threading and be done with it. On the user side you have more chances the end-user himself might cross-thread it on his own and then we have CS issues, them swearing up and down it wasn't them - and when you are speaking of threading a plastic tube onto a metal base its more likely to happen as the metal base will cut into the plastic threading (like the knife through butter) and allow mishaps/cracking/splitting to happen. Then you have the QC issues we face with aforementioned factory in our friendly vaping equipment production country/environment with one more thing that could be fouled. I obfuscated my last point purposely as managers of aforementioned production environment follow our threads in the GotVapes forum...closely
If they ever do this it will be an accompanying model and not to replace the non-threaded model we have now. Believe me, Chris and I have discussed this with each other and them.