Dude, the patch has been out for like what, a couple of hours? Calm down. I reported the Carn-Dûm pikemen issue, which is obviously a bug.
About the Battlewagon, it can now completely kill a Carn-Dûm Ranger squad in two trampling strafes, which nets it an instant level 3-4. Its trample damage has been increased by 50%, which is a massive buff, giving your opponent less time to react with pikes. Also, its role has changed a bit, and I think the changes are good for a non-cavalry faction. The Battlewagon is tanky and slower, and the oil cask now does more damage too, if I am not mistaken. Instead of trolling your opponent with near infinite trample, you actually have to be more selective with your trample. It's similar to a Mordor Troll at the moment, which is interesting.
It's not like they received only nerfs, you are overreacting. I think adapting to the changes is the most important thing here.
The powerful support functions are now tied to the Forge, which I think is appropriate. The only thing I am not certain of is the pricing of all the upgrades and the Battlewagon itself. This needs to be narrowed down more perhaps.