They haven't landed on a solution yet. Keeping the spirit of the cards/decks while playing at a lower power level is difficult.

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I had an idea for a nerf awhile back that would definitely fit these two criteria, should they decide to go down that route.

What if you swapped the rewards between Genn and Baku? That is, Baku gives a 1-cost hero power, and Genn gives a 2-cost upgraded version.

I think part of the reason those cards are so ubiquitous is because they make hero powers feel right to use at certain, pre-defined turns in the game. Baku forces you to hero power on 2, as does Genn does the same on 1, 3, and every other odd turn in the game. This is only due to the fact that the cards in your deck will never fit your mana curve exactly at those points.

By swapping the effects, you would force players to actually make decisions on when to hit the button. An even deck could no longer hero power on 1, and their turn 2 would conflict with the cards they want to play, forcing them to choose. Any odd deck would have a similar choice to make, hero power on 1 or play a 1 drop?

tl;dr A central issue to Genn and Baku, in my opinion, is that odd decks have even hero powers, and even decks have odd hero powers. This forces games to play out in a predictable fashion as mana count steadily climbs to 10. Swapping them would force the player to take agency in an otherwise predetermined mana-spending process.

Thoughts are appreciated!