Qt, WPF, OutSystems,...
The tools are out there, even Delphi is still being sold and having a yearly conference in Germany.
They declined because only developers working at Fortune 500's get to pay for software.
When one only wants to have free beer, they get to have what the street bazaars can offer, instead of what the monks are using at the cathedral.
I think all the stuff about nocode/lowcode/jupyter/etc say exist the market, but is going in a overly weird route, as if nobody know what this tools can do.
My dream is rebuild it: https://tablam.org!
Amen. Every so often I boot up Lazarus and lament what could have been. Even the best web-dev frontend tools and frameworks do not come close.
I wonder if there is even a market for those sorts of tools today, though. I wasn't there for the decline of Delphi (and FoxPro, et al), so I've no real reference as to why they declined.