Even if they reverted Rose back to release Rose, I think zombies would still stomp all over plants.
That basically is the issue here, it's mostly played by kids who don't know what team work or balance is, they never will. They're on a mission to kill the whole enemy team solo and when they fail miserably and die they respawn and try again...
Then we have the trolls, who come in here and ruin it for everyone by mocking and making fun of players who want balance, because all they do is play the OP classes and steamroll the rubbish ones because well, that's what a troll does, by nature. They suck at most games, so have to abuse and outplay little children in an unbalanced game for satisfaction and self worth.
I am sure it will be balanced, but after seeing that horrendous Nerf coupled with ridiculous buffs that weren't required, part of me just wants to stay silent and not say anything.
I never played rose and I never cried she was overpowered. I levelled my Unicorn Chomper and Paleontologist and now they're both maxed I experimented and tried out a few new characters and I have to say, some of them and on the zombies side are ridiculously overpowered.
Therefore Plants need extra power to compensate...