Personally I think Lytro is a joke and will be just like 3D cameras - may always exist in some form, few followers that like to "neatness" but in the end, it will occupy a very, small, niche market.
Don't get me wrong, it is a great tech breakthrough but the cost will be extraordinary. The camera will be ungodly high and the computer system needed to manipulate the images - will have to be the most capable out there. Add to that, I doubt there will be any batch operations so each file will have to be touched. I do not believe it will be a fun system to work with unless you like spending hours or days on a single image.
As on the actual original post, weather or not some rep actually knows something - well if you have ever worked in an office where there are a bunch of sales reps running around, you know they rarely know what going on especially with their vendors. You also know that they will take any opportunity to push anyone from a lower cost option.
There is some logic there though - D3100 at $600 with a 18-55vr lens, 5100 at $750 for the same, the Nikon Mirror-less? Say it is about the same as the Pentax Q which is pre-order, $799. Say store price is around $650 with a lens & kit, that is smack dab in the 3100/5100 territory.
If you are NOT a serious amateur on up, as we all are here, what you buy to put in a purse or bag for the same price, smaller/lighter or awkward and larger? If Nikon's mirror-less sells very well, I think it is just time until the 3100 series is gone.
I would love to see the 3100 turn into a F-mount Samsung NX like camera. Slap a 35 or 50mm on it and that would be a great camera.