Getting at least one of Schneiderlin / Sigurdsson out of the team permanently would be a good start.
As much as we would all like a bigger cull, it can't happen in the short-term.
I do think though it would send a clear message if either one of those, and I would choose Schneiderlin, never played for the club again after yesterday.
We are at the stage now where individual players have to be selected and binned off at the first opportunity, on grounds that they offer nothing.
One by one, however long it takes, these players have had too much indulgence.