In the show, Pod was a pretty good competent (in the sack and out) as Tyrion's squire, but the minute he hooked up with Brienne he became a klutz.
Kevan said he was on his way to Casterly Rock, so I think he's done.
Yeah, Tyrion's journey was dull as hell. Yet for some reason putting these great characters together is somehow lessening them. You could have cut from Varys' last line in E1 to them meeting Daenerys.