Brian, just because the bandwidth of Thunderbolt is vastly greater than the speed of a Redmag, doesn't mean it shouldn't be used or that Red shouldn't make a Redstation with Thunderbolt. You're forgetting that Thunderbolt is daisy-chain-able, whereas USB3 is not. The idea is that you'd have a few hard drives in that Thunderbolt chain and still transfer faster than FW or even USB3. Also, Macs do not have USB3 on them, so Mac users (and there's more DIT's using Macs than Windows) need Thunderbolt since it's faster than eSATA.
That Sonnet Thunderbolt ExpressCard adapter is not the best solution. You're still limited to the speed of the ExpressCard. You're also forced to have it at the end of the chain because it has only one Thunderbolt. That's the main issue with Thunderbolt devices right now. Most are single port only so you can't daisy-chain or use an external monitor (unless it's an Apple Thunderbolt display). The manufacturer's just don't get it.