The Week: "Why the talking filibuster won't work." - "The talking filibuster worked for Jimmy Stewart, but it probably won't work for Democrats."
I forget where I saw it but somebody said that, in addition to dragging out the legislative session, the talking filibuster means that - at any time - a Senator can note a quorum is not present. So if Ted Cruz is filibustering at two in the morning and asks for a quorum call, either the Democrats need to get 51 Senators on the floor or the Senate adjourns.
So the filibuster ain't goin' anywhere.