The only consumer protocol faster than USB 3 is Thunderbolt, but nobody is going to make a Thunderbolt card reader.
Lexar
does.
Cool. It almost makes me wish I had a use for one :-D
There are Macs that have Thunderbolt ports, but not built-in USB 3.0 ones. Maybe their users would be potential customers for Thunderbolt-based card readers.
Why do you say..... 'no built-in USB3 ports' ???
My MacBook Pro Retina 2013 has TW) USB3 ports AND a Thunderbolt port !! .... all of them for sometime earlier even, had the same.
Before making such bold statements better check your facts firsts (if your memory cannot be relied upon). TB was introduced by Apple in 2011, USB 3 was added in 2012 (to laptops, minis, and iMacs). And if you want to count the TB display, it was introduced in 2011 as well but kept its USB 2 ports throughout 2012 and 2013.
That 'sometime earlier even' of yours was just one single model year (2012).
The MacBook that I have, was bought in October 2013...if I've got my thoughts right on THIS one...the model was first introduced in I'm sure February 2013. That's "some time earlier" enough to be what I had in mind... and YOUR statement was made in July 2014.. reading just as though it referred to such as models almost 18 months ago or more.
Be careful in making your statement which cannot help but be regarded as being in relation to models which are almost in the 'relics' stage now.. certainly back to 2012 which really is a long time ago... and for which I'm quite sure most owners have no thought whatsoever of using USB3 for anything.