There's always a chance it could go tits up with the Sheik if he passed away, or there was some major political issue between the UK and UAE, but investors at United could equally decide that football's not for them, or it's time to change their investment from one club to another. After all, they aren't necessarily football fans, let alone United fans. They are just investors.
Even if it did go tits up at City, we wouldn't necessarily be back to pre Sheik days. We've grown hugely and would be an entirely different proposition to new owners. You can't put the genie back in the bottle.
Things change. It's pointless them believing change can only happen to City, whilst kidding themselves they are immune to it.
There ARE some real whoppers on every forum, but there's a few sensible ones on RedCafe too who do actually credit us as having a fantastic squad and having changed as a club (which isn't going to just 'go away').