The constant (every 4-8 years) changing of presidents is awfully inefficient.
Every 4-8 years you have a new guy trying to learn how to wield an immense and extremely complicated power.
You similarly have a lot of institutional knowledge being funneled out when new candidates clean shop.
If Trump fixes our democracy, i.e., installs safeguards that ensure corruption on this scale is never again possible, if the people want to elect a leader over and over and over again so what. Why should the people not be allowed to re-elect a good leader?
Idk, I can't imagine Trump actually wants more than 1 more term. He is quite old, his life must be stressful as fuck, and has been for many years. I wouldn't be surprised if he's just trying to start the conversation.
One thing's for sure though, a constitutional convention seems ill-advised until after this treasonous media-complex is dismantled,