An idea
On the surface, your idea seems to make sense. However, it could lead to balancing problems and make one order more powerful than the others. Of course, the easy way to prevent this is to make the order skill weaker than normal skills as they did with racial skills. If Anet does that though, no one would use the order skill and you might as well not even have it.
Well, orders finishers or emotes could be a start in a different direction if not skills.
It would be nice if the orders were a little more relevant to the player.
You know something to tie you more to your order would be nice, but I am with what DarkShriek said. They would have to be weaker than profession skills and thus they much like racial skills would see nearly no use whatsoever. And well aside from the skills is the only thing that differ between races that does not also differ between the orders.
On the surface, your idea seems to make sense. However, it could lead to balancing problems and make one order more powerful than the others. Of course, the easy way to prevent this is to make the order skill weaker than normal skills as they did with racial skills. If Anet does that though, no one would use the order skill and you might as well not even have it.
If anything you would be right about any new PvE skill being significantly weaker. It’s an intended and more than likely a continuing theme throughout GW2, as I doubt they’d want something like “Save Yourselves” to happen again.