I don't think they have a future in the Liberal Party after the damage they have inflicted on their own party. It's not just Trudeau who dislikes them -- the majority of their own caucus mates wanted them ejected.
Their opportunism and constant need for atention has also turned off a lot of the progressive voters they will need. They have ended up helping the Conservatives.
You sound bitter. I don't doubt that many current Liberal MPs would not want them back because they have cost the party its lead in the poll and more important, for many of them, a greater chance of being personally defeated. But if a new leader said he wanted to broaden the party tent and end the internal disharmony, there is the possibility that they might be an attempt to recruit them, over the objections of some Liberal MPs I am sure. After all, Trudeau was the one who said we need to end the disharmony of the Chretien and Martin factions.
As to opportunism, in a world where a gaffe, let alone a scandal, can send you tumbling rapidly downwards in the polls or an election or do the opposite for the other side, politicians, by the nature of the job, are opportunity seekers. It is hard to find those who will take a risky stand on an issue, even when one does it with some calculation of how to minimize the damage to themselves or increase the risk to their opponent. Very few politicians, or people for that matter, make decisions that 100% pure selflessness, ignoring risks and not attempting to minimize negative consequences, in order to advance the cause. For that reason, I do admire JWR and Philpott for going well beyond the conventional approach in taking a stand.