I made a thread over at GW2 forums in regards to my idea:

https://forum-en.guildwars2.com/forum/pvp/pvp/Guild-Wars-1-GvG-PvP-Brought-To-GW2/first#post2039559

Basically with your question Johnny - It wouldn't just be the numbers transferred - They could copy over the entire skill list over and replace the existing skill system with the GW1 skills.

Examples: Guardian = Monk, Engineer = Ritualist, etc etc.

Keep in mind this is just for the exclusive GvG/HoH/RA arenas that I am suggesting and that these numbers would not affect the existing GW2 in any way shape or form. (Except the fact that people will realize how incredible GW1 PvP is and the existing GW2 PvP would die a much needed death).