Startup Idea : Car listing integrator

Here in Brazil there is a lot of used car stores and there is a lot of car listings (see webmotors.com.br, icarros.com.br). If a SHOP owner wants its vehicles to show up in any listing and his company website, he will have to duplicate service. This can be very dangerous if he forgets to update some of the listings. my goal is to build a platform that unifies this process: the user will add, edit and remove vehicles in one place and all changes will be synced to the listing websites. Is that a good idea? :)