That only applies to the third question. Hackers don't care about the miner's incentive, and neither do governments. Besides what we're seeing right now is less companies building mega-mining farms and a more uneven distribution of hashrate.
Nope, wrong again. In reality there are more and more mega-mining farms being built. Just look at the hashing distribution right now and where we were this summer with GHash.
As more of these continue being built the risk continues to be distributed effectively rendering hacking attacks and/or government takeover ineffective.