My usual 2 cents....
If I stay 10 times at an average rate of $150 / night, this promo amounts to an extra 6k points.
I am not complaining, 6000 free points is better than a sharp stick in the eye, but I don't see this as an incentive to move stays with Hyatt offering 1000 - 2000 gx bonus points for most stays, at the hotels that I frequent, pre-Q4 program announcement.
Having re-qualified for SPG Plat in March, if Hyatt has a decent Q4 program, SPG may not see me until January.