Even if a large company like Facebook did want to help add direction, they'd have to do so within the confines of internals and the RFC process.
The prehistoric luddites and trolls on the list would shout down any truly language-improving proposals in the same way they always do, regardless of source.
The only way to get rid of those unwanted elements would be a fork, but that would be unproductive. The remaining thing keeping PHP so popular is how amazingly ubiquitous it is. A fork wouldn't have that advantage, especially in comparison to languages and environments that are objectively better anyway.
The prehistoric luddites and trolls on the list would shout down any truly language-improving proposals in the same way they always do, regardless of source.
The only way to get rid of those unwanted elements would be a fork, but that would be unproductive. The remaining thing keeping PHP so popular is how amazingly ubiquitous it is. A fork wouldn't have that advantage, especially in comparison to languages and environments that are objectively better anyway.