The counters to the mages exist, some since the Alpha but many more have been added since, from stealth heroes to dive heroes to positioning altering abilities to stuns that can eliminate the safety of a ranged assassin's back line positioning. The problem is the viability of some of these heroes in high level play.
I mean they just added Greymane, he can pretty much dive to and melt any single target squishy. Problem is he dies just as quickly, if not quicker without support. What would make The Butcher viable for that role? Which is kind of the role he's supposed to fill. A talent that adds a mini-stun to every hero between the Butcher and his intended target? There's kind of already a long list of heroes and abilities that can and do hard counter those ranged back line assassins.
You guys kinda made the same point I did, though. There's lot of stuff in here that would work, but it's not viable due to the power of said spellcasters and the meta surrounding them. Everything flows through them and picking them, so these other heroes need to be moved up or new heroes need to be introduced which move the casters down. They
can hard counter them, but there's a reason Jaina, Li-Ming, and KT are getting picked before these other heroes and it's because ultimately they are better in nearly every situation. The counters aren't good enough to quell them compared to how the counters themselves can be quelled by just running the same mage + accessories every game.
Illidan used to have silence built into his base kit but it was changed in the Alpha to what we have now, for example. That would be very interesting (and frustrating) right about now.
Idk watching THH is mostly because of the changing landscape through patches and tourneys. Not sure a P2P game will have nearly the content/balance updates as a f2p one.
Also not sure if it'll even reach HoTS numbers competitively. CSGO only got huge recently and that's like more than a decade old and practically f2p. What are the Twitch numbers for OW atm?
The P2P thing might be an issue that is true. HOTS numbers for tournaments barring Blizzcon isn't a very high bar, though. It doesn't have to do much to get there. Blizzard has to not fuck it up like they did HOTS out of the gate first, however.
Since it came back OW is typically in the top 10 or 12 on Twitch depending on if Seagull and a few of the other former competitive TF2 and the like people are streaming. Trikslyr finally started streaming it, and ZPs streams only that now AFAIK.