Tera's not getting banned. Abandon hope for that. You'd be lucky if you could get even get Tera Preview or Tera Blast banned. The NDOU suspect test just proved that there is apparently a very large unvocal majority willing to clear the benches to defend it. No comment on walking wake.
The thing is this - the metagame overall is trash. Tera is the main issue, but since people would rather have a meta with tera than one without it, pressure has to be released somewhere. Something's definitely getting banned after the Tera changes fall through because at the end of the test, that 46% of people who were unhappy with the competitiveness of the tier on the last survey will still be unhappy. Kingambit is the biggest offender right now. So that will definitely get banned. Then probably dragapult which is bad now but gets much worse when Kingambit isn't on every team. Then Iron Valiant. Sneasler, Samurott, Garg maybe. Then maybe 5-8 mons later we'll abandon this ship for gen 10 with the overall meta unaffected.
This kind of off ramps into something that I've been thinking about for a little bit now. You have a card game. Card games have archetypes. Aggro, Combo, Control, Midrange generally even if they're named something different (burn is aggro for instance). A card game dev notices that control is underperforming across the board. Instead of removing cards from the meta that are blatantly overperforming and hoping that at some point control gets it's turn, the card game dev might remove a card that is not overperforming in and of itself, but it's very existent makes it challenging to play control. Say a card exists that stop you from countering cards, that's generally splashable and most decks can fit it in. It's not the reason why Aggro is overperforming, but it's a reason why control is underperforming. The dev could simply just banish that card to buff control. That liberty exists because it's run as a dictatorship not a democracy. If a dev wants to ban something, it's toast.
This is a pressure release valve that smogon currently does not support. We're reduced to playing wack-a-mole with mons that may be strong enough by themselves to get enough support to get a positive result on a suspect test. And praying that if we remove enough mons, the meta will normalize on it's own. The problem (especially this generation) is that there are so many threats to wack-a-mole that this process is going to take forever before ever coming close to normalizing. Banning kingambit doesn't suddenly make defensive play more viable. It's just one name off the checklist that stretches down the block.
The reason I bring this up is Garg, Gholdengo, and Ursaluna. None (gholdengo especially) is ever likely to see a suspect test in the near future if ever, but they make it nearly impossible to play defensive oriented teams because they get to ignore traditional defensive tactics, and their most reliable counterplay is not available to defensive teams. 'Just revenge kill ursaluna' keeps it off a suspect test but doesn't fix the fact that stall teams are delving deep into NU to find Drifblim to find any counter to it. Removing them from the tier might result in a more evenly balanced meta because defensive teams get to rally, but the current system does not support removing them short of a council quick ban which after the volcarona shitshow (even if it was justified) is definitely not going to happen. The current suspect system is too overly favored towards short term 'broken or nah' changes and not long term 'does this mon make a better meta'. There needs to be some kind of mechanism to advocate for meta changes not wack-a-mole changes.