For the longest time I didn't have enough red minors, yet Legendary tasks rarely dropped any. Lots of other colors, but hardly ever red. However, since I got all the reds I need, suddenly red minors are dropped from tasks way more often. Can't explain it, just pointing out that you can't count on the tasks if you only need one color, as it may rarely or never come and the other colors you do get will feel like a waste.
As for the poll, I voted ditch minors simply because I don't need them anymore, can't speak for other people - they are welcome to come and vote themselves.
For the same reason, I don't want the minors to be replaced by Runics - of those I had plenty extra, long before I had enough minors of any color. For me, seeing runics in legendary tasks will feel much more like a waste and will annoy me to no end. If they're going to be removed, either just remove them or replace them by something that's useful to anyone (such as the vip keys suggestion above).