Maybe, maybe not. It won't apply to the big house publishers any time soon, and they're the ones who have the most ridiculous prices right now. It only applies to 'self-published' authors who use the DTP platform, and most of them have lower prices already anyway. I see where the article says that Amazon hopes to use the new structure to bring pressure on 'regular' publishers too, but I doubt that will happen any time soon...
It might not take as long as you think. Any publisher who wants the 70% royalty will have to play by Amazon's rules. Otherwise, they only get the 35%.
Just for kicks... let's take a novel priced at $14.99. With the 35% royalty, the big publishing house is making $5.25 on each book sold. (Not counting anything being paid out to the author.) If they lower their price to $9.99, and get the 70% royalty, they get $6.99 per book sold. If they're selling 1,000 books a day, they're losing $1,740 a day. On one book. And that doesn't take into account how many more books they would sell at the lower price.
I can't imagine they won't start playing the game with money on the line.
Vicki