Over the next 4 years nostr will need next generation clients with new features such as:

- key rotation

- login with legacy networks

- personal storage

- instant messenger with perfect forward privacy

- built in wallets w/ advanced features

- streaming payments

- AI run locally and remotely for sats inc. virt. assistants

- full client customization

- single sign-on to micro apps, and existing web apps

- widgets and micro apps within notes

- music, video, entertainment as first class within notes

- games

- productivity and integration tools, calendar, alerts

- full nostr operating system, inc. runnable on a phone

First gen clients can optionally pick the features they want to add, but none should be mandatory. Maybe not every feature can be achieved, but I think most can.