That's a burning question that has been speculated upon, in both directions, countless times now. It's anybody's guess though. All we can critique them on is how they behave as a business, from day to day. Trying to forecast the longevity of the business, though, regardless of how rickety it seems from the outside, is probably futile. For all we know, Guy could be independently wealthy, and can do this indefinitely. We just don't know.
If Guy were independently wealthy he would have self financed, rather than the preorder investor disaster.