Heyward and Hosmer are pretty good examples of highly thought of guys doing poorly in their second years.
I think if Catricala were raking you could send Ackley down, shift Seager over to second and try him there, but as of right now there isn't a good replacement for Ackley.
I do hope that Carp comes up when his rehab is over and they send Smoak down. Talk about frustrating.