Schemaless databases are such an awful concept for any data you actually care about. After 12 years in the industry, I've realized any natural controls (e.g. schema) you can place on maintaining the integrity of your data, the better off you'll be long-term.

Data matters the most. Your UI will be a tired POS in 3 years. Your backend data store won't scale for your new business problems. It'll be time to migrate, and then you'll start by asking yourself how clean and well-managed your data is.