I'd like to see Elijah and Gary gone, frankly. They weren't terrible, but they weren't good, either. There's a difference between an actor and a voice actor; it's very obvious throughout the series who is and isn't a pro VA. They should be spending the massive amount that it costs just to pay for those names on other things, like half-decent gameplay and real voice talent.
They did good having folks like Cree Summer, Mae Whitman, Billy West, Kevin Michael Richardson, and the guy who played Cyril (I can never remember his name; he plays Monkey Fist on Kim Possible, though

). All of those performances were pretty good. The celebrity "voice talent"...not so much (see: "Cynder's horrible robot voice is a big part of what ruined DotD" for reference). Mark Hamil would have been great in DotD if somebody hadn't pitch-shifted his voice into a garbled mess (believe it or not, Hamil is actually one of the best VAs out there; he's been the voice of the Joker since the 90s, played Firelord Ozai in "Avatar: the Last Airbender", and shows up in a lot of unexpected places).
I daresay LoS could use someone like Tom Kenny. He's incredibly talented and can do drama just as well as he can do comedy. He didn't just voice Spyro back in the day, he voiced almost every male character in RR and YotD.
Heh, they should get Steve Blum to voice Spyro.

That would be hilariously awesome. Scott McNeil would do good work for this franchise, too. Or Neal Patrick-Harris, in case there's a musical number.