The second Bitcoin becomes centralized, all those things can arbitrarily change and I have almost no doubt they would change sooner rather than latter when the government comes knocking. You seem to forget that Bitcoin offers these rules only because there are no doors for the government to come knocking on, point guns at people's faces and demand them be changed, it's just peers in a network. Not so anymore in a centralized network.
I wholeheartedly agree with you, hazek.
In the worst imaginable case, the ability to validate the currency becomes more expensive, not impossible. As long as it is not impossible, Bitcoin does not become a centralized payment system and you still have sovereign control over your money. Its still peer to peer, at worse its peer group to peer group. Of course this won't happen, because the devs are well aware of the dangers and are reasonable people who continue to put the technology and its users first. Reasonable people can come to compromises that provide for the greatest benefit for all parties.
What makes you so sure that this is the case? Everyone can be corrupted. And given the personality pattern I've observed from part of the TBF members, I'd suppose they're even more prone to corruption than the average Joe. But I don't expect the majority to agree with that.
I feel at some not so distant point in future I'll be forced to evaluate alternatives to Bitcoin, because Bitcoin's features I've enthusiastically embraced in the beginning will have been changed beyond recognition.