of course NSA could crack this stuff all along.
Any proof or is it just the tinfoil hat talking?
Pretty sure that applies to every post this user has ever made. I don't think I've ever witnessed them utter a word of sense in all 294 posts.
How would I become a part of this consensus?
Help secure the chain. Most people do that by running a non-mining full node. You'll then check every block conforms to the consensus rules which your chosen client enforces. The alternative is to become a miner. However, mining likely isn't an option unless you have a fairly significant sum of money you don't mind putting at risk, because you'd have to buy specialist hardware and return-on-investment is not guaranteed.
How is the incentive for mining going to be preserved after the coin creation is not enough? Can consensus create more coin for mining incentive? Without mining bitcoin will collapse, right?
Getting off-topic with this part, but the network will run purely on transaction fees after coin emission ceases.