I think it would even be a very good idea in order to test combat mechanics and spot overpowered ( as well as underpowered ) skills as we did with the alphas and betas of DOS1.
However, we'd need a PvE arena rather than a full PvP arena to do so - history has shown us that balancing for pvp is very, very different than balancing for PvE, and at core DOS2 is still a PvE game.
