PHP, _like Javascript_, can be great when used with some extra care. I have no beef with PHP (although omg do they waste space with curly braces on their own lines and vast amounts of indentation!)
A good foundation can be in any language, such as PHP. But it needs to have a modern, better architecture with a more consistent base library/API for the plugin writers to take advantage of. WP is like 1.0 of this. We've learned so much in the last 10-15 years; it would be nice to have a completely rethought foundation.
But for the plugins, I think there should be a standard interface layer (based on probably http, tcp, pipes, files, even memory stores for communication). Then plugins could be written in any language, hosted locally or remotely, and sandboxed.
A good foundation can be in any language, such as PHP. But it needs to have a modern, better architecture with a more consistent base library/API for the plugin writers to take advantage of. WP is like 1.0 of this. We've learned so much in the last 10-15 years; it would be nice to have a completely rethought foundation.
But for the plugins, I think there should be a standard interface layer (based on probably http, tcp, pipes, files, even memory stores for communication). Then plugins could be written in any language, hosted locally or remotely, and sandboxed.