Hmm, I don't think it is really a selling point. A block cipher also implies needing a technique like CBC to prevent watermarking, and using CBC actually helps with oracle attacks.
Oh, I'm a fan of prepadding, and there are other surveillance problems that TLS doesn't solve that are similar to the voice analysis attack. Web pages on a site have distinct patterns of load operations and I'm certain that if we haven't established how to profile a visitor by the pattern of packets that are sent and received, that it's only a matter of time until we do.
An interesting paper on using padding to obscure length: http://cihangir.forgottenlance.com/papers/lengthhiding-corre...