Since there is already highly efficient event driven I/O and a context switch is bound to happen for applications that require major business logic in user space, I doubt there will be huge benefits for large server applications.
Maybe simplified versions work with this paradigm with significant performance gains, but I doubt that you could simply plug Varnish or nginx in and see much of an improvement.
There is still quite a complexity gap between e.g. interpreting firewall filter rules and a full blown web reverse proxy..
I think you could use this to generate a reverse proxy for the current config in nginx, maybe if only for some subset of configurations. Like a fast path for common flows. But it wouldn't be easy.
Maybe simplified versions work with this paradigm with significant performance gains, but I doubt that you could simply plug Varnish or nginx in and see much of an improvement.
There is still quite a complexity gap between e.g. interpreting firewall filter rules and a full blown web reverse proxy..