In a world where 40 year old quarterbacks send pictures of their weener to sideline reporters, I think it is fair to expect a lackluster penultimate episode of a show that is usually high on drama.
I see this episode as a mix of two parts. Part one is the unnecessary part - the part involving Midge's entry out of nowhere and Sally experiencing the onset of teenage rebellion. Part 2 is the usual corporate drama, or the part that actually complements the plot lines we've seen thus far in this season. SCDP is shown some hope of business only to have it taken away a day later.
I am not sure what the writers are planning for the finale. I would hate cliches like SCDP getting a ton of business because of Don's rant on pretty much every object of print media. Well, one more to go.