Well, after ten years, anything can lose steam, but the timeslot placement has been no good of late either.
As for Chibnall and Torchwood- presumably we're not talking Cyberwoman here...
That Gatiss one was a disaster though, wasn't it? I just don't get what his block is with Doctor Who. It's a shame, because if he'd turned out some good scripts he could have been a good choice for showrunner (he was interested in reviving the show himself before RTD did it).
But I can make the Chibnall point again here- the concept of a found footage Doctor Who story is good. The concept of monsters born out of sleep is good. The concept of a monster using the Doctor as a means to spread its own creepy viral publicity is good. As it turned out, the episode was terrible in most ways I can imagine, from the acting to the pacing to what the monsters were made out of to an ending so abrupt/confusing there were threads on the fan forums asking when the second part was, or just what the hell was going on. It was actively structure badly, which is unusual for modern Who.
But- this is 'good idea done badly', and I still rate Gatiss as a writer. This is, again, where Chibnall bounces off of me. All I ever see from Chibnall is 'dull idea done ok'. Which is no shame per se, because to be a professional scriptwriter who can reliably turn out usable episodes is no small thing, but I'm afraid it just doesn't do for me in what I like with Who.
Still- we'll see.