The hobbits are assuming ever greater importance as the remains are better studied and the implications become apparent.
I have to disagree.
If HF and his ancestors coexisted – in time, probably not in place – with HE, in all variants, HNS, and HSS, and then went extinct, I'd say theirs was not a 'defining' chapter in human evolution. But an abberation, a non-starter if you wish (from our present perspective of course). HE, in all variants, HNS, and HSS being all around HF means that they, HE, in all variants, HNS, and HSS, literally passed HF by. Apparently without consequences. Another pointer at HF's inconsequence for hominid evolution, imo.
I don't see "the hobbits are assuming ever greater importance". It looks more like a sideshow in human evolution: yes, it was there all the time, but nobody ever took notice for 2 million years...! Apparently HF was THAT uninteresting to the 'surrounding' hominins. No matter the specific reasons.
I wouldn't be surprised if HF will prove to have more than a slight connection with Australopithecines, and that his classification as 'homo' will be disputed.