I'd highly doubt it.
Relic will decide if they support further updates or not. But since AoE4's success was more "so-so", a complete fail of CoH3 will probably cause serious issues for Relic financially. I don't think they would support CoH2 with updates in these circumstances.
With all the giveaways CoH2 has gotten, there is also no huge financial potential in this game anymore. They have supported it for the community and to keep brand interest high while they were developing CoH3, not because they'd make a ton of money off of CoH2 anymore.
It really doesn't take much for them to get some more money out of this game. They could literally come out with another 3 commanders for each faction. At 5 bucks per faction and reusing abilities they could make a decent return with virtually no work on their part. Most would complain but buy it anyway just to try something new and balance wouldn't even be that important since Overwatch and other commanders haven't been toned down.
I know I would throw down for:
Soviets - Assguard commander with KV2/Mother Russia, Airborne/IS2, maybe another commissar commander
Ost - VSL, AssG with Ele, another P4J commander
OKW - Falls/WStuka barrage so it is more anti emplacement, VG SMG with Command Panther for sight and buffs, Ostwind/tank commander or heat shells
USF - Pershing/AssE, Rangers/EZ8 maybe with WC51, 105 Sherman/Rocket Strafe with Rifle mines