As a long time observer of companies and the way they work, I've found that many have an engrained culture that reaches from top to bottom that makes it very difficult to make decisions like this (to make third-party lenses), at least in a timely fashion. By the time they finally admit that something must be done, it's often too late -- gearing up a new set of lenses takes time and investment capital, and few venture capitalists really want to get involved with a sick company, especially when there are strong competitors in a limited market.
If Leica released a premium set of lenses at a premium price, how many Canon shooters would choose them, rather than a (cheaper) L lens? Some would, obviously, for reasons of either prestige or because they desire a particular look, but (1) ninety-nine percent of shooters wouldn't (couldn't) see much difference and (2) might be nervous about spending a lot of money outside their system for whatever tiny advantage might exist. The premium DSLR market is relatively small; the market for third-party super-premium lenses would be a tiny fraction of that. Not enough to support an entire industrial enterprise...
If Leica is going to survive as a camera company, something that was in doubt even before digital came along, they need to build, quickly, a super-premium camera, either digital range-finder or DSLR, which will in some ways out-match Canon and Nikon, just as film Leicas did. Making a few lenses won't cut it.
Here's what might work: A small (less than 1000 grams), handy, fully-professional 22-megapixel rangefinder with a set of lenses that provide extreme wide-angle and medium-range sharpness, extreme exposure qualities (one way or another, to what would be the equivalent of a sharp ASA 3200) with great dynamic range and low color artifacting. By Christmas. That's not impossible, though it may be unlikely...
Leica made great cameras, but they moved too slowly back in the 90s, and now they're stuck with the ramifications of that tardiness. Frankly, I think they're toast.
JC