I think there are reasons to have civilian population especially in Paracel islands. And that will also have positive effect on military base.
And I'm working under the assumption that these islands will be enlarged over the coming years.
I think discussion about the viability of having any civilian populace on those islands at all can happen if we see them actually enlarged in future in a manner that actually has the acreage for it.
Until then, entertaining the idea seems highly premature.