I'm looking at future production a little differently. I'd like to know what/why is the constraint. Components? Money? Labor? Quality? Is there anything else?
If current sales (or whatever) can fund future production, money shouldn't be a factor. Labor is infinite, so that's no excuse. It seems to me that as long as they can obtain parts and they don't incur any quality problems, they should be able to build as many as they can sell.
I know it's not quite that easy, but if they can pump 10K out the door, they should be able to replicate the process and do it much more efficiently in the future.