I really think they should just move chow into the classic set, it's the only card ever released to give decks a good early game anti aggro board control tool that didn't just end up being used by the aggro decks themselves.

Plus it's the only card a controlly deck can use to prevent losing control of the board in the first place allowing more minion heavy mid range decks to thrive by actually playing their own decks which I think is much funner than the classic control strategy of having a deck almost entirely full of removal and catchup mechanisms and just trying to play answer after answer after answer.

They should just transfer chow to classic to play that role because they may recognize the function and try to design cards in new sets to fill it but based on their track record I have little to no confidence in blizzard's ability to strike the balance again without accidentally making the card so weak that it never sees meta play (looking at you, all of TGT but challenger and nearly all of brm) or so strong that it's an autoinclude in every deck (like with large parts of naxx and the top tier cards of gvg.)

In fact before LoE I thought chow was the only well designed card in the entire game. LoE has inspired some hope, but their balance numbers are so often wrong (every inspire minion other than murloc knight is so overpriced an entire game mechanic sees no play) it's worrying. Sometimes they're so far from the right ballpark it's baffling (take another look at poisoned blade and realize multiple people in the design process signed off on the numbers you see on that card.)

Removing chow from standard and trying to fill the anti aggro niche with new cards feels like intentionally breaking something to have an excuse to fix what isn't broken.

TL;DR: Permanently make zombie chow available in standard format Blizzard. Please.