Will this be the first ongoing series to actually get a real, planned conclusion?
novel series pretty much did. The books had an arc that came to a conclusion in the final volume. It was a conclusion that also served as a new beginning, just in case the decision was made to continue the series at some later time, but it was a planned ending for the series as it stood at that point, and it hasn't been revived since.
Then again, maybe that was more of a miniseries than an ongoing series, since it was only, what, six books long, not counting The Valiant