Exactly, Neil. That's what I stated earlier--the bill has to be accepted by the House exactly as is.
If labor feels ""betrayed", they will have to make the choice in the fall to support Democrats or not. Their decision will show how self-destructive they are--since if they don't support Democrats they may well get Republicans.
And liberals have to not only realize they cannot get a public option on a silver platter--maybe through the "trigger"--but they have to urge their Representatives to accept the Senate bill with no changes--since as you note that will obviate the need for the bill to return to the Senate. So no filibustering.
Point is: after all this time the Democratic Congress has to be able to show something accomplished. They are well on the way to earning the status of "do-nothing Congress."