Bitcoin's specific supply schedule works well as a marketing tool for those that see merit in Austrian-style economic thought, but the reason Bitcoin is interesting is the censorship resistance! Of course, having an immutable and well-defined supply schedule helps enable censorship resistance, but it takes much more than just that.

So the potential danger to Bitcoin extends beyond just the potential for the supply schedule to be altered, in fact any attack against the network's ability to enable censorship-resistant payments is a danger.

All of that is to say, I think that regulatory capture is much more of a pertinent risk, than the potential of a future tail-emission hardfork.