I have the same issue. Unless you have extended warranty, you are in for a surprise. I brought my 2017 15" MBP to Apple, they couldn't fix it on time, because there's a lot of parts involved just for the Touchbar. I had to leave on a trip, and I was left with an unrepaired MBP, out of warranty, and Apple wouldn't sell me Apple Care even when they didn't fix my laptop in the first place.
It seems to be just an aesthetic issue, at least for now.