Okay, I know I'm going to get flamed for this but...I liked the alternate timeline ending.
Why not? They've trashed the universe as we know it so why not bring in a Sliders type arc?
Patterns Of Force was one of my favorite TOS episodes.
It looks like WWII never got finished. There was an old movie, "The Shape Of Things To Come" where WWII lasted much longer then known history by several decades.
Technically it's not a "time travel" ending per se, it's a timeline/different dimension ending.
Honestly, I'm interested to see how they restore the timeline or maybe the timeline gets changed to what's "known" and established.
Maybe it's the, well hell, the fans are ticked off enough so let's go for broke mentality
(When do Doc And Marty pop in with the Deloran???)
BTW, nice seeing Jeffery Coombs in the episode. He was good as Weyoun/Brunt in DS9.
/dons flame proof suit and ducks