This is tricky.

If nobody reads an ongoing series, it will die out before it's finished.

On the other hand, I haven't read ASOIAF and Kingkiller because there's no expectation for them to be finished. But these are very specific cases.

The majority of the book series actually are concluded, eventually.

So, if I get good recommendations for an ongoing series, I'll try to read it. But if it's a recommendation for a dead series, I'll pass.