It may become a line if Israel loses its compass and allows either ultra-orthodox rabbis or ultra right-wing realms to dictate laws that seriously challenge one of the world's most vibrant democracies. However, this law can't be construed as a line, much less a "downward spiral". It is a polemic law, nothing more than that. Of course, Haaretz lay in wait to portray it as a line or a downward spiral, but as for now, it isn't.
Abbas: West Bank arson is a 'crime against humanity', vows to petition ICC (Haaretz)
from the article: Israel's boycott law: The quiet sound of going fascist