It's easy to get a Firewire 800 to 400 cable. This will work fine on the Macbook Pro (which has a firewire 800 port). Also, with the ExpressCard/34 slot on the MBP you can buy a card that will give you an extra firewire or eSATA (even better for fast HD's) connection.
I've never tried running my Apogee Duet via a firewire hub, but apparently it works well and this method is endorsed by Apogee. I'm not sure about the Ensemble though, best to check directly with Apogee.
But, I understand what you're saying. Check out the feedback link above to register your feelings directly with Apple.