I would love to see him back. Nice person and supportive without being cloying. Also, clearly an expert in ballroom and Latin, which we couldn't say for some of the other newer pros, including Gleb. I think, as his English improves, and we hear more from him, he will become beloved by viewers.
Mind you, I would also love to see Gleb back. The show needs a variety of pro "types", especially a few Marmite characters. So long as they give him the adventurous celebs each year, he'll bring something to the show also.