The New House Filibuster
I would bet that the sit-in tactic used yesterday by the House Democrats will become more common over time. It’s pretty easy to find 50 House members who feel strongly about something and would be willing to tie up the chamber and rotate in protest. The Speaker in these situations would be loathe to use the Sergeant-At-Arms to arrest these members or bar them from the chamber–that would look awful. And if social media can broadcast the protest even when the House is in recess, then there is no disincentive to do this other than the physical discomfort. (Sure, those broadcasts violated the House rules, but again, I doubt that the majority will do anything about that.)
Granted, this was not a true filibuster in that the Speaker was able (by ignoring the shouts of protest) to conduct business, but of course only very limited business can be conducted if the well of the House is occupied and speakers cannot be heard.