Awhile back I saw an implementation of a network stack in user space... unfortunately the author has a beef with Java and the Java version was written quite poorly; but despite that all versions were significantly faster than kernel (go figure).
Really what you are proposing is that server Operating Systems and hardware should have a "general NIC" for mundane shared tasks, and a dedicated NIC for handing over to a process and saying GLHF.
Bypassing the kernel. Java is already sandboxed we don't need the kernel unless the net/ssd drivers crash completely.
It's a huge task/risk, but 30% is alot.