The author is a Reuters Breakingviews columnist. The opinions expressed are his own.
Yuval Levin sums things up correctly and thusly:
This opening of the eyes of the Republican appropriators (brought about by a groundswell of outrage from conservatives) is the most important part of the omnibus story, and maybe of the lame-duck Congress in general. Combined with the minor revolution John Boehner is attempting to enable in the House Appropriations Committee (by appointing some new members who might be best thought of as a kind of crop of anti-appropriators) it has the potential to change the culture of Congress (which has long consisted of three parties: Republicans, Democrats, and appropriators) in a very important and constructive way—if it lasts.