Nah, the entire roof is listed as 16k, but you'll never have a situation where the entire thing needs to be replaced. Unless you roll it...
Over it's life you may need to replace the rubber seals at some point - a couple hundred bucks. Maybe the hydraulic motor. Maybe. Im sure the car will be 10 years plus before that's even a thought.
Don't stress over the drop top it's solid. 70k on mine so far no issues.