I like a few of those…
The one with the Harry Potter crossover and J. K. Rowling would have made a good Christmas special.
And the one with the Nazis could have been good.
I’m quite happy they didn’t do the Rose as the ultimate companion. Bleh.
One the article didn’t mention is that “The End of Time” (Tennant’s swan song) was originally to have featured the Brigadier. When Nicholas Courtney was unable to appear due to his failing health, the part was rewritten for Wilfred Mott. That one breaks my heart.