http://bugs.winehq.org/show_bug.cgi?id=22132
--- Comment #9 from Dmitry Timoshkov dmitry@codeweavers.com 2010-03-23 10:31:24 ---
Last time I checked, wine version 1.0.x does not use libmpg123 yet. So, I actually don't see the big issue with backwards compatibility. Yes, there is the case of someone having a recent build of wine-1.1.x installed breaking it by upgrading mpg123 to 1.11. Then that someone needs to rebuild wine -- I consider that far less severe for a development version than for a stable end-user release. Isn't the development release series there to iron out issues before stable?
You are forgetting about Crossover and other binary Wine packages. They still need to work if a user upgrades his/her system.