Generally it would be nice to have something like this. It would also make leveling faster. But it would be useless for those who start at launch.
Also, the PVE spec "works" for most classes, as far as i know. Sure, it could be better, but nobody should have real problems i guess. You can most likely make something better out of your skill points if you chose to actually read your skills and Buy Blade And Soul Gold - you'll have to do that anyway later in the game. Another problem i see is that if the system works really well, people will just press the button and play with what they got. I kinda dislike the idea that people wont have to think about how to play/skill anymore themselves.
Edit: When i read through my post i also realised that this would mean that most likely the build would be locked in place. It wouldnt change much. Let's say there is a decent build for class X and 95% of players dont care and just press the button and play with what they got. That also means that 9500/10000 players will have the old build, even after a new (possible completely different) build was found out by the 5% who care. Not only do you not have the "best" build in this scenario, but it could even be some mixture of two builds, that doesnt even work at all.
And the biggest problem would most likely be to actually make the system work. It's not as easy as it sounds as you, at any given point in your leveling process, will never own all skill points. So the question is... how to decide what to skill first? How to know what's important skills. Maybe the whole build doesnt even work until you are 40+ and have some skillpoints in all required skills or so? The problem increases with hongmoon levels.
I doubt that it's worth the effort. While it would definitely help new players, it also brings some Blade And Soul Items. Probably the best/easiest solution would be that they simply rework the build a bit. If at all. I mean, what we have works - maybe not perfect, but it works.