Been to an Apple store lately? People still flock to the cMBP. I know two people in the last 6 months that chose the cMBP. There are two types of consumers who purchase the cMBP. Those who actually need the extra functionality of ports and drives, and the casual user who thinks they do.
What you seem to forget is, those of us on these type of forums are the one's that follow new technology and are usually early adapters. Many casual consumers still think all laptops come with disc drives and a place to plug the internet cable in. It freaks them out when they see something like the Air with no disc drive or firewire, etc. It doesn't matter that they haven't put a disc into their laptop in 2 years, they think they need it. When they see that it is cheaper than the retina model AND it has more ports, it is a better value in their mind.
But if they just discontinue it, nobody will care. Apple fans will just flock over to the sensible option, the 2015 Retina Pro, which is usually on sale at a lot of shops for $1200 or less.. My bet is it will be killed off after WWDC.
You have to make consumers change their mindsets. When the 17" and 15" Pro were removed, die hard fans complained for a few months, then got over it when they realized how much more advanced the Retina Models are.
I would even consider a Macbook Air over the MD101, at least it has a close to HD, 900P screen and a superfast PCI-E SSD