I don't see any reason why Geno would regress. He has a better supporting cast, with more experience in the system. Barring major injuries to RB OL WR TE, I see him putting up better stats than he did last year. He has big $$$ incentives to do so.
The more interesting question is, what will Waldron do in year 3? Some of his play calling got a little stale towards the end of the season. He will need to be more creative, especially in red zone situations. He has the weapons and the talent to get it done.