Isn't there a little bit of 'chicken-and-egg' here?
Why would miners use these new 'efficient schemes'
in the first place if it was to render the fee market
ineffectual, unless they were already relying on something else
(blocksize limit) to do that (support a fee market)?
These schemes reduce orphaning and allow miners to make a greater profit. It's not hypothetical, Matt's fast block relay protocol is the simplest and least effective of this class of scheme and it is used almost universally today to carry blocks between pools. (A good thing too: otherwise there likely would only be a single mining pool now...).
@Gmax I did some sleuthy reconnaissance for you
here.

And deploy a system for democratic governance that is better than ours.
About that:
http://i.imgur.com/5kUV5d3.jpgBut really, no one can 'neuter' bitcoin classic but themselves; and they've done that just well from day in most of the same ways as Bitcoin XT.