I disagree with that solely from the fact that I don't see many/any paladins NOT reforging into expertise. I'm personally reforging a piece or two from mastery into expertise on my set. There's still value until we can cap in gear. That'll go away as T16 or HT16 progresses though so I'll agree with you at that point.
I made those stat weight somewhat more haste friendly than the I believe the contribution is for damage smoothing actually. From what I'm currently simming in terms of TMI the value of mastery is closer to 4:5 and dodge/parry is more valuable than 1:3 in ratio of haste because of the fact that pallies have so much haste. It boosts the value of every other stat as it approaches the GCD cap.