I think you can still buy the custom bars though, you can "buy" the UK ones at least, although the process is so convoluted and they're so expensive no one ever has.
You can actually buy those road bikes. In fact, in a Specialized Concept Store in my home town they had a Kwiatkowski WC frameset that they were going to build up as spec to sell and another if you wanted a different spec. You might not get Nibali's paint, but within 9 months I think you'll get the exact same components (if they're testing prototypes).
I think this is why pros all ride factory frames these days, but I could be wrong.
However, in this case I do think it's just a bit of sour grapes.