In the general case I would agree, but there needs to be a point where you can say that every effort was made and opportunity given and that the accused has actively refused to participate in the trial.

> And what would be the point? He can't be punished as he's not there so why not just wait until you actually have him?

I can see your point here, but after some time I would think that it would become difficult to continue with the case. Witnesses get hard to track down, evidence lost, etc..