Honestly tell me how many people here want the new forum to be out here ? I don't think many people want the change as they are happy with the current forum. Maybe the demand of the new forum is not so high and therefore we are having a delay in it development/testing. Maybe we need to deploy a poll and see if people really needs a new forum ?
The forum software has been requested many times and various features which have been requested here are expected to be functioning on the new software, furthermore, I do not think general opinion actually matters as the project is already too far gone to be halted with so much money being invested already.
If the holdup is due to low testing, I believe there could have been an alternative solution beside getting volunteer testers for the website.