I'm personally hoping the future holds some way to blend the openness/interoperability of the web with the performance of native apps. Maybe React Native, maybe web assembly, etc.
I hope that pure mobile development doesn't win, because the mobile app ecosystems are way more controlled than desktops/servers, and if everything went Android/iOS, it would be a major loss for freedom.
But on HN that is a sure way to be downvoted.