I disagree with this statement. grsec has been a proving ground for a lot of hardening technologies throughout the years, many of which are just starting to make it upstream through the Linux kernel political process. As long as the team that works on the grsecurity patchsets continues to innovate, it will not become irrelevant; instead, it will continue to be a testbed for things mainline will pick up and re-implement at their discretion.
You seem to think grsec isn't in Linux due to the politics of submitting patches, grsec hasn't submitted piecemeal patches and their attitude is to derail conversations into name-calling. I recommend reading the comments in: http://lwn.net/Articles/663474/ or really anything where grsec team interacts with people. You can be the most intelligent human alive but if you cannot interact with people in a productive way it doesn't matter.
