There is always better, more stable, more secure firmware around the corner. If they are going to wait for 8.0.1, why not wait for 8.0.2? And 8.1 will certainly be better than 8.0.2, so why not wait for that?
It would be nice to see a jailbreak that didn't take four months for a change. I say release it on 8.0 if they have the exploits. There are currently plenty of jailbreak dev groups out there to get working on subsequent versions.