I think at best there will be in the next 2/3 years, a price freeze agreement for away fans with prices rising in line with some form of metric or the like.
Clubs will also perhaps follow the policy of a certain percentage of home tickets being discounted, but for the rest prices will continue to go up.
At the end of the day City have a firm policy on "we'll charge you, what you charge us" with other clubs, but for me it's a rather "pass the buck" policy and not pro-active, and thus I don't think they'll be very proactive in trying to reduce the revenue they get from fans, we have a "revenue growth" management team, and that means getting what they can from the fans too, that's the downside.