I hate, hate, hate retraining rules. If I'm not happy playing my character as is, why should I have to suffer through an extended period of playing like that while I slowly make incremental changes. If I'm not having fun I'll say to the DM, "Hey DM, old buddy, I'm not really enjoying this character as is, it's not working out like I had hoped, can I change it around so I can enjoy my gaming experience a little more?" And if the DM isn't a complete jerk he'll probably say, "Sure, no problem." I would hope that the next edition contains advice to do just that, to let DM's know they're not breaking any "rules" to make that kind of call.
The only thing incremental retraining rules are good for is power gamers looking to have a rules legitimized way to take the new awesome or swap things around for optimization that has somehow been officially approved by the rule book, "You can't complain about this, see it says so here in the book!"