I generally agree with these principles:
https://en.bitcoin.it/wiki/Prohibited_changes

1) Bitcoin is defined with 21 million units
2) Demurrage is prohibited
3) Rules which increase centralization are prohibited

Additionally, I would like to suggest

4) Any changes which destroy fungibility (I.E..blacklists) are prohibited
5) Any changes which destroy the Pseudonymity of Bitcoin is prohibited

These 5 principles are core ideals which define bitcoin and any divergence from these and I will consider the hardfork an Alt and quickly lose all interest in supporting these changes.

What is listed as disputed involves changing the consensus mechanism away from 100% PoW. As many know I have been very critical of the security weaknesses found in existing PoS implementations so am certainly no alt shill or fanboi, regardless am open to a fruitful discussion of different mechanisms to better secure Bitcoin at lower costs.

Vitalik Buterin has been a great contributor to the bitcoin space and has written a recent article which appears to address many NaS problems:
https://blog.ethereum.org/2014/11/25/proof-stake-learned-love-weak-subjectivity/

Personally, I think we should be open to discussing these ideas honestly and don't make any rush decisions in suggesting a hardfork. There are some huge elephants in the room we all must acknowledge between the near impossibility of mining at a profit for the average user, reliance on centralization of pools, and the security costs from disposable ASIC's and electricity.

Discuss....