On another note, did we ever test the metagame with Mence banned, but Latias unbanned? I totally forgot. Since we never had an actual metagame with Latias free and Mence banned. So we can never be too sure how that metagame would be like.
Looking back at the suspect test history, I don't think we ever did. It seemed like Latias was banned almost immediately after Manaphy was due to 60% of the people involved voting her Uber during Round 3-4(Manaphy was over 70%). Jumpman and Aeolus wanted to be more efficient going through the Suspect process, so Round 3-5 was basically just Round 3-4's results excluding testing. Someone correct me on this if I'm wrong though.
But, y'know, after looking through the thread that Conflict linked in his post, I remembered that I didn't want either Latias or Salamence to drop to OU for many of the same reasons as shrapn3l. So, yeah, I'm no longer on the fence and I don't support the Latias drop. Would rather leave this metagame alone since it doesn't necessarily need "fixing".
I know that testing it doesn't mean an unban, but...that's kinda the whole point of testing it, isn't it(to try and unban it)? If everyone universally agreed that Latias should stay Uber, then the idea of setting up a "suspect" ladder for testing wouldn't even come up.
It's really not even just the Specs set. Latias is very hard to wear down for the stall player; even harder than Flygon because of Recover/Roost. Every stall team will be forced to carry a Pursuit trapper. Yeah, that happens now because of Starmie and Ghosts, but Starmie is also a spinner. Stall has the flexibility now to pressure Starmie without needing Pursuit. Those same stall teams don't even run a spinblocker. Stall IMO becomes less creative/more rigid and the balance tips back in favor of offense with Latias dropping. I admit the current meta is in favor of stall right now, but only slightly.
A couple of other metagame predictions if you will:
Teams won't be the exaggerated 3 dragon/3 steel that every pro-Uber argued in the Salamence testing thread on PO last year. Rather, I think there will be "a little more Dragon, a LOT more Steel". So, something like Latias + 2-3 Steels would almost be a requirement as opposed to now where you can get away with running 1 Steel.
Heatran would be more versatile, but still drop in usage. It'd go from being the go-to guy for SR back to Choice Scarf/HeaTrap/Life Orb sets since even Specially Defensive sets get 2HKO'd by Specs Surf. But none of those were exactly common during LatiMence IIRC.
Metagross would shoot back up in usage and be the go-to 'mon for SR. Seemed like people were throwing SpD EV's on it before Latias got banned.
Specially Defensive Jirachi will jump up. Scizor will be number one again. Tyranitar gets even more use than it does now.
FWG would cease to exist ofc in favor of (Water)/Dragon/Steel, which again is STILL better than a FWG core even in the current metagame where Dragons are scarce. Infernape would also fall off the face of the earth and be brought down to "only use Ape if he's the best choice for a U-turner(he usually isn't)".
People using standard FWG cores are just lazy teambuilders in my book(see LizardMan example above). But, you will always have lazy teambuilders. There are copycats in every competitive game, so if Latias does indeed drop down, you can't be mad when Dragon/Steel gets spammed everywhere. I'd rather just have this meta where there's more options, even if the lazy players refuse to explore them.
tl;dr I basically agree with Aerodactyl Legend(except on Mence :P), LizardMan and shrapn3l if you decided to bother looking at the Salamence thread that was on PO last year that Conflict linked in his post.