Unless there's a significant change in human behaviour, convenience is always going to trump everything else including privacy - we have seen over and over again that people will happily hand over their personal data in return for a free service that is simple to use. So any solution where you control your own data is going to have to be as convenient as alternatives, otherwise there'll be an opening for a new centralised "we'll do all the hard work of owning your data for you" mega corp tech titan.