West Bank Roadblocks: Becoming Less of a Roadblock to 2 states?

Some roadblocks in the West Bank are coming down.  In an article in Haaretz by Amos Harel and Avi Issacharoff, it is apparent that in recent weeks:

The Israel Defense Forces has lifted some of the main, permanent roadblocks in the West Bank, which have played a central role in restricting the movement of Palestinians, mostly between the main Palestinian cities.

Alongside this development:

the defense establishment has allowed several hundred Palestinian businessmen, holders of BMC (Businessman Card) permits, free access to Israel.

In Nablus:

A city that had been under complete siege, [the roadblocks] have now all been lifted. Several months ago the roadblocks to the west and east of the city were dismantled, and two weeks ago the northern and southern roadblocks were also lifted.

The upshot of these developments is relayed by the World Bank, which

Stressed in each of its recent reports that only a substantive change in the roadblock situation and easing of restrictions on movement between Palestinian cities would enable economic growth in the PA.

The lifting of the roadblocks is being done with the authorization of Prime Minister Benjamin Netanyahu, Defense Minister Ehud Barak, the Chief of Staff Gabi Ashkenazi and with the blessing of the Shin Bet.

One can ask - why this change and why now? 

The security situation has surely changed for the better in the West Bank.

And, the role of the White House, hmmm.