I don't think chronological timeline is going away though, it's still there on the Mobile Web version at least. There's two tabs: For You and Following. For You is the recommendation timeline and Following is chronological.
At least before you could click that "Home" icon and switch to "Latest" and it would reasonably stick.
I gave Twitter a lot more leeway than I should've through all this due to network effect and intertia, and I regret that a lot. When this "For You"/"Following" thing happened I actively went back to Echofon and Tweetbot, and was planning to make a subscription just to avoid what I was seeing on the first-party app/website. And now I can't even do that.
Wouldn't be surprised if Tweetdeck is forced to move over to the "new" Tweetdeck (which is just a wrapper for the web experience) soon.