Guild marks should be left in place the way they are. Have the rewards be different, like signature crystals for crafters. Come on, how many times will it take to sign that bad ass piece of gear with 5 materia attached to it? As for DOW/M it can give out some extras as a fleet of foot ability but not lnc only. Make the amount hard to get as it should be, but that's how mmos should roll. Phasing out GM would only remove a possibility to make your character better than the next person, it should remain, to give you that extra ummphh.