That's a very simple question to answer (with another question... sorry): how many people do you know who still use or are even interested in high-end scanning or scanners in general?
Quite obviously, there was simply no business case that could be presented to X-Rite's accountants, which would make them decide that the time spent on updating the scanner profiling part of the app would be spent wisely. I can't even remember the last time I used my scanner, let alone bothered to make a profile for it.
And with the huge reduction in the price of medium/large format sensors constantly falling even further, many who might have shot film and then scanned, might have just decided to take the plunge and finally change-over to a digital workflow.
Regarding your Eizo screen, I would and most definitely do recommend all owners to purchase an i1d3, regardless of what sensor hardware they currently own. With the i1d3 being so inexpensive and the results so good, it really is doing a dis-service to onesself if you've got an Eizo screen and still using an old i1d2 or i1Pro (or any other old sensor technology) for calibration and profiling. At the very least, you owe it to yourself to see if you can borrow an i1d3 and give it a try with ColorNavigator 6.x and see the improvement for yourself.
What exactly do you mean when you say that "from what I hear, seems like could get quality as good as the RIP ones"? What is as good as which RIP's output? Many RIPs are using 3rd-party colour management engines and profiling solutions, many even using X-Rite's own profiling technology.
But for ANY printer driver to be compared to a properly and competently configured RIP is essentially not possible. Using a standard driver, obviously it is not possible to linearize prior to profiling, no such thing as ink limiting or channel limiting, no control over the screening algorythms in use, etc.
What RIP are you comparing/using? Most any RIP should have visible improvements in the shadow tones and darker regions of a print than any standard driver. Grey Balance might not necessarily be improved using the RIP but linearity almost certainly will.
And regardless of which RIP a person is using, one can always make use of the RIP for linearization and ink limiting and then use i1Profiler (or any other profiling app) for creation of the final profiles. There's absolutely no reason one has to use the complete profiling solution which the RIP natively supports and uses.