Govt appeals, lawyers get lots of money, Govt loses appeal, goes to parliament where they all talk for as long as possible before it eventually gets voted through.. if it gets delayed enough it could be towards the end of next year due to french and german elections.
Problem is nobody knows what form this will taks "soft" or "hard" Brexit.
Northern Monkey ... who can't upload a bleeding Avatar
Isn't that the more likely scenario - MPs will try to influence the Government as to what line it should take in post Art 50 negotiations. As all have correctly pointed out it will be difficult for an MP not to vote the way his or her constituency voted but there is a world of difference between taking a hard position and a soft one. That particular distinction was never put to the electorate.
Or the Queen gives the ok, and then that is that. It's well known that the Royals hate the EU and everything it stands for.