Your comment about "dual SATA won't happen" is very short-sighted. Just like with anything new, anything is possible - there could be a software piece written or a combo hardware-software 'bridge' device to pair the SATA ports and make them into something similar to a "teamed NIC."
Again, your comments are short-sighted and close-minded - and I mean that in a constructive way. NOBODY can say what spec might be developed or modified to exceed current limitations. History shows us that there are many cases where "an extension to a spec" has made it much more functional than the original spec.
Since true SSDs only have been out for about 4 years, the other person's comment also is a bit over-dramatic: that "the 6Gb/s limit has held back SSDs for YEARS". I agree that PCIe or other interfaces likely will need to be used for even fewer limitations, BUT that's not to say that some enterprising person could not come up with at "SATA port aggregator" that would hook "2 SATA ports to 1 SATA port, where the SSD would sit; and it would have a hardware/software device that would "team" those SATA ports, effectively doubling the throughput - use your imagination!