Well, okay, I guess that 7 of each party is just enough to mean that the only way the Dems could go would be to say, let the filibuster go! We ain't gonna do it! Because the Repug leaders would definitely have not just 51 votes but 55 + 7 = 62 votes and then they could do whatever they wanted to.
I wish the Dems wudda said: "We approved over 200 lousy nominees and we're done compromising. Then let the filibuster go! Let the two-party system go!"