I agree, I think NW’s knee jerk reaction to follow suit with other airlines that have diluted their FF programs is a bad call.
We now have a choice of earning great (albeit abysmally diluted) miles, being treated relatively nice by the majority of NW personnel and having the best F (domestic) upgrade opportunity of any other top 3 or 4. (I am at 100% myself)
Or:
Change over to another airline that offers a more advantageous/liberal FF program and be content sitting C more often.

Interesting choice, instant gratification of sitting in F or better chances of using your miles for the seats you want and when you want.

I will wait till the first few months before I do anything drastic.