If the leveling is anything like it used to be in WoW or is in Skyrim, having an offspec is going to be a MAJOR project(not complaining). If I'm a light/medium armor Healing Templar with a destro staff, well thats not going to serve your tank offspec well. So say you wait until 50 to worry about an offspec, your going to have to go out and level your armor skills, weapon skills and ability skills.
Dev's have said that you'll have enough points to get all the skills in your class by end game which begs the question, how many exactly? Could it be that if you keep going out and finding sky shards you could very well have more points than other 50's? Is it possible that you can have 2 fully "Morphed" specs at all times(after hunting down every skyshard)?
Perhaps by adding a little extra thought/gear switching during leveling you can have a very powerful offspec by the time you hit 50.