It's creating a "second instamine" where the PoW rules are changed in secret, the secret is revealed like a few hours before the PoW-change block, and as a result the only people who can develop miners that actually work on launch day are the insiders.
I'm also a bit worried about miner availability upon algo change. However, I expect the internal CPU miner of the daemon to work.
I can guarantee you that pencil-and-paper mining will work. It's also irrelevant.
The situation to worry about is not "there are zero people GPU mining". That won't happen.