Prospect of PD's Forward Movement

The availability of immigrant visa numbers in the EB2 category has been going up in minimum 6 month increments for the past several Visa Bulletins, but how long can this fast forward movement sustain? The rapid forward movement was possible because the demand for visa numbers was less than had been originally predicted by DOS. I wonder if the immigrant visa numbers have now moved forward sufficiently to a point where there are many eligible cases, leading to some slowing of the priority dates over the next several months.

Thoughts?