If you're not prepared to compromise and accept some level of new rules to come about then to be perfectly honest you shouldn't be involved in any discussion involving Aviation Safety as times change, tech changes, and therefore the rules must change with them.
Well pardon me for having an opinion!
What changes in times and tech does mandatory carriage above 10,000' reflect, justifying a change in rules? It's the same air we're flying in and the same supplemental oxy we are and are not breathing as we were 50 years ago. There have been for many decades, many, many GA aircraft that were and remain capable of going waaaay over 10,000' and cruise there for a long, long time.
The experiment has been run in the USA and the results are in.
Maybe some of us understand the risk, are perfectly able to and responsibly do mitigate the risk effectively, without a new rule.
Once we all give ourselves a collective pat on the back when the new rule is made, how are we going to confirm that people are using the oxygen?