I don't think it would be Schiff, but I think the hyper focus on the federal government, coupled with the fact that statewide Democrats aren't going to return to large numbers until January 2019, make the environment ripe for a second House to POTUS candidate.
There's a good chance that we'll have one or more candidates from the House, but it's not like we don't already have an enormous field of potential candidates even without them. There are ~10 sitting Senators and ~5 sitting governors being floated as possibilities, plus former officials who don't currently hold office, like O'Malley and Castro, plus people from the business world, like Iger and Schultz. It's not hard to count to at least 25 on the list of possibles.