>>I don't think it's as much of a dealbreaker as some people
It is the one big thing that makes me hesitate about buying an rMBP. SSD's are prone to failure according to many articles I've read and they also have a limited life span even if it doesn't have any defects. Once the thing gives up there is no way to easily swap it out and just insert a new one.
Also, sometimes I need to swap out hard drives (or SSD drives in this case). With the rMBP that is not possible. The rMBP is a nice computer but I really hope they see the error in their ways and add a replaceable standard SATA SSD.