Palestinians use any and all means to establish a foothold in Israel Proper even now, before any final negotiations. Imagine if some "token" number is given a right of return. Whole villages will claim family reunification, any excuse at all to join their "kin" in Israel proper. " Two state" has always been a code for "two stage". Unless the "Refugee return" is off the table, it is hard to believe that Palis really want to have a sovereign state of their own, alongside a sovereign Israel.
Netanyahu: Most of Americans see eye to eye with Israel on dangers of Iran deal (Haaretz)
from the article: The Palestinians must not repeat their mistake of 1947