The key is that magic word "sovereignty". The Golan Heights Law makes no mention whatsoever of Israeli "annexing" the Golan, or claiming "sovereignty" over it. The Golan Heights Law does something else entirely: it replaced the existing IDF MILITARY law with Israeli CIVILIAN law. Big whoopie: that is a matter of "jurisdiction", not "sovereignty". If a future Israeli PM wanted to get around this new Knesset bill (not Bibi, obviously) then he/she need simply ask the Israel High Court of Justice to rule on wether the Golan Heights Law 1980 actually extended Israeli "sovereignty" to the Golan. The answer from the court will be: nope.
Saudis warns U.S. that 9/11 responsibility law would erode investor confidence in America (Reuters)
from the article: Aluf Benn / Netanyahu tying his own hands with Golan bill