Well considering the article states that USB-IF said no, it's safe to assume it as fact, i can try to dig up the link if you really need it
I don't "need" it, but I find it a bit odd that nobody's posted a link to such a statement on the USB.org website.
perhaps a "hub" will be $99, I'm not envisioning a single "dongle" to be $99, regardless, as you said, all prices are a guess at this point
Any TBolt dongle is going to need most/all of those components (TBolt controller, upstream/downstream MDP connectors, motherboard, PCIe controller for whatever the device is).
If Apple charges $29 for a passive dongle that consists of two connectors and some wires, encased in tacky white plastic - do you think that the price for an active PCIe device with at least two IC controllers will also be $29?
...isn't the point of the daisy chain being able to just add on another device, why would you need to be unplugging anything, i'm confused by your statement?
I suppose if you can randomly unplug 1394 drives from your Apple while they're being written to without any concern, then TBolt would be the same.
On Windows and UNIX, though, that's not a good idea. There are caches and other bits of data that are better to flush to the disk before removing it. (Log-based file systems will usually protect you - but that's a bit like crashing your car because the seat belt will protect you.) If the external disk is part of a RAID volume, unplugging it can and will destroy the data.
Again, the issue is when you add/remove a device *upstream* of the active disk. Downstream operations may be safe (assuming that TBolt doesn't "hiccup" when the chain is rearranged).
Note that, on Windows at least, these issues occur with eSATA drives. For USB and 1394 drives, Windows disables write caching and other performance enhancements so that unexpected disconnects are very unlikely to cause problems. eSATA drives, however, appear to be internal drives and high performance caching is normally on. Unplugging an eSATA cable is exactly the same as yanking a SATA cable off an internal drive - stuff happens.
Since eSATA uses hubs, not daisy chains, in normal operation one would never need to unplug disk "B" in order to unplug disk "A". Therefore, you just dismount disk "A" when you want to remove it. You don't have to worry about disk "B".