I personally would like to see more efforts going into open source self-host alternatives, and cloud providers enabling one-click distributed mail server deploy

I personally would like to see more efforts going into open source self-host alternatives, and cloud providers enabling one-click distributed mail server deployments that enable all the functionality you'd expect from like Gmail. Such as virtual folders (labels), better mobile apps, and reliable email service. Too much effort lately has been going into cloud hosted solutions, when I know many users would gladly pay $5+ per month for quality self-hosted email service.