To answer your question, NO, the fix is not a permanent fix, as a matter of fact, a good majority of those who have had their RMS replaced have it done down the road. Sometimes a lack of actually driving the Porsche can play tricks on its return...
Resale in most cases are not effected as most buyers are not concerned, it doesn't mean you won't be questioned by someone but it's not a common buyers question. 450 is right though, the LN bearing and flange kit can be a great selling tool.