DaasYochid,
Coffee addict is right. Their approach to halachah is agenda driven. At some point, when there is enough driving them (pardon the pun) towards chillul Shabbos, they will do that, just as conservative, which was supposedly halakhic, did.
True, other things may fall first, but it’s just a matter of time.
I agree with you and coffee addict that they are capable of this. If they decide down the road to drop the “Orthodox” moniker, then all bets are off. If they try to keep the label, however, they will preserve some tokens of observance in order to say, “hey! We’re Orthodox!” I personally think that driving on Shabbos would be one of those tokens, since it’s perceived as a “challenge” to do, but is uncontroversial in the secular liberal mindset.