a two-state solution is not viable as long as settlement expansion continues

"It is ludicrous to argue that the settlements are an "obstacle to peace," because they were not an obstacle to offering the Palestinians a state on three separate occasions: (a) in July 2000 at Camp David; (b) in the Clinton Parameters six months later; and (c) in the Olmert offer at the end of the one-year Annapolis Process in 2008. Each time, the Palestinians rejected a state on substantially all of the West Bank and Gaza with a capital in Jerusalem.

The real obstacle, as Michael Mandelbaum showed in his landmark essay in the May 2016 issue of COMMENTARY, "The Peace Process is an Obstacle to Peace," is the Palestinian refusal to accept a Jewish state within any boundaries, much less defensible borders. Until the Palestinians endorse "two states for two peoples"–something the Palestinians have not yet done–the process will be stuck on side issues such as settlements. Until the Palestinians declare that a Palestinian state is an end-of-claims solution, and not simply a step in further prosecuting a specious "right of return," the Palestinians have not even put peace on the table."

http://www.jewishpress.com/indepth/opinions/its-not-the-settlements-stupid/2017/01/04/