100% Pipe-dream. If Vancouver trades Miller they need a back-up. Even if Markstrom is better, he can't be both starter and backup, and neither Bachman or Demko is a realistic option.
On the other side, once Quick is back, Miller is not going to get the playing time he wants (rightly or wrongly) to try and get another contract for next year.
If Miller is traded, it would be to back-up a more unproven Goalie for a playoff run, think Pittsburgh, if MAF is dealt, or maybe Dallas, although those teams are not trading buddies (Hamhuis).
The only way to do it would be to involve more pieces and other teams, and deals like that are extremely rare now.
Conclusion: it's not going to happen.
LA would be better off rolling with what they've got, or looking for a more traditional back-up (someone who is comfortable being the back-up and doesn't have higher dreams/potential)