I have an idea to put on the table, but I don't know what it's worth, since I'm still rather on the fence.
It's been said several times that (assuming MixMence), while he can punch holes in an opponent's team with decent prediction (I find that this is absolutely the truth; when wielded properly, a Salamence is definitely able to significantly weaken an opponent's Pokémon, regardless of whether or not he actually faints them), Salamence is easily revenged, granting him a (perhaps high) maximum of 2 KO's. Now, first of all, I think that we may agree that we will not be seeing Salamence on a great many stall teams. But we may go further to say that, unlike a stall team, each and every one of whose members is integral to the success of the whole, a team utilizing Salamence's power may still function well if Salamence is removed; this is the big leap, the one that I'm slightly unsure about, though it seems plausible. Thus, the opposing team, if it is a team which has a delicate mesh of its party members, like a stall team and unlike a heavy offense team, if you know what I mean, has lost a great deal more than the "Salamence team" has in this ostensibly one-for-one tradeoff.
This may perhaps be the cause for the apparent sharp rise in stall teams on the Suspect ladder; they no longer have this force threatening to remove one of the fundamental links to their stall chain.
Maybe you could look at it as a spiderweb, in that as a whole it is remarkably strong, but if one of the supporting strands is removed (by Salamence Draco Meteoring a cobweb (boom)), then the whole thing may fall apart more easily. (Don't pay too much attention to this analogy, I can already see that it's pretty flawed.)
I don't know the validity of this statement, but I think that it definitely has enough merit at least to be considered.