Hello Tino7,
Wolfgang rates Uber Ceramic as 3 years for 'painted surfaces' but your point is still taken, exactly! what do we do? Yes it will have to be re-applied or some replacement in any case as the attributes of the coating will have diminished to the point of being ineffectual in its purpose.
Coatings in general will require a polishing for proper removal, that is, light physical abrasion with a light polish and appropriate pad. Best case scenario if in 2-3 years duration you havent 'corrected' the paint finish it'll be about time anyway so the coating will be compromised regardless.
So in this case the benefit of the polishing phase will be 3 fold; removing previous incarnation of coating, leveling out swirls, scratches, etc. and prepping the surface for the fresh coating.
Literature regarding clear instruction as to proper coating rejuvenation upon 'End Of Life' leaves me a bit wanting, what I stated is simply general conventional wisdom and may not apply for all coatings.
Steve