ZFS to become default file system in OS X?

[Michael Brian Bentley]

If they choose to deploy with ZFS, I expect ZFS to be the default 
option for new installs and what will show up on the disks of new 
machines from the Apple store. I would not expect it to forcibly 
install ZFS when you update an OS from 10.4 to 10.5, and I would 
expect the old FS to be an option. Some new things just won't work 
with the old file system, s'all.

I don't expect Apple to provide a backup drive with every copy of 
Leopard. I also don't expect Apple to develop a "standing-still 
migration mode" where, once Leopard is installed, it proceeds to 
convert a an existing Mac OS Extended file system on a drive or 
drives into a ZFS file system on the fly while you're using the 
machine or while the machine is idle. That'd be cool just to see it 
done, tho my hair stands on end just thinking about using it. File 
under "wouldn't it be great if it did this and it just worked?"

I think revision disk recovery packages as it is have to check to see 
what file system is on a drive before they go and try to fix it, so I 
don't think old versions will be dangerous to try and use on Leopard 
systems for that reason.