To leverage the full potential of Thunderbolt, you need some high end components that will take you beyond 500MB/s at which speed will definitely dwarf USB 3.0, but they will also add to the cost of Thunderbolt products. There is, however, a limited number of applications that require such transfer rate and that only prosumers and professionals can tell whether or not the increase in performance justifies the added cost. For this reason, Thunderbolt won’t be going mainstream anytime soon. On the other hand, USB 3.0 and USB 2.0 have almost reached price parity and it’s a no-brainer to pick the former for everyday tasks.
In summary, Thunderbolt and USB 3.0 has their own respective strengths, and consumers can decide which route to go based on their budget and requirements.
Despite the USB 3.0′s advantages, USB 2.0 already serves as the ideal interface for a number of applications as it provides ample of bandwidth in these situations. USB 3.0, in this case, isn’t necessary and could increase the cost. For the reason, the market for USB 2.0 devices of all types isn’t going to dwindle in short to medium term.
Firewire’s main claim to fame is that it is a highly efficient peer-to-peer, full-duplex, non-polling data communications protocol with very low overhead. Firewire delivers much higher actual throughput than USB 2.0 and can achieve much closer to its theoretical 800Mbps data rate than USB. Where a Firewire 800 7200-rpm hard drive can deliver sequential transfer rate of around 90MB/s, USB 2.0 hovers more around 40MB/s and USB 3.0 averages at 150MB/s. It remains to be seen what impact S3200 will have on the computing landscape, but with Apple backing Thunderbolt, there’s little hope for Firewire.