Can you convert a ten-year-old gunite pool with a vinyl liner to a tile pool and how much would that cost?

Hey well i own an in ground liner pool and for a few years now i have heard that i cannot just slap tiles on the walls. they have told me the walls arent stong enough to support the volume of water in my pool my deal is how cant they they already do support the weight the 5 mm thick vinyl sure as hell isn't helping so i say go ahead tile away be sure to check what kind of grout to use an be sure to tile with freeze resistent tile if freeze is applicable in your area. have fun!!-georg