The surveyed Wikipedia treatment covers the family's geographic distribution, contact history and a rejected Mosan macrofamily proposal, but does not state whether a Proto-Wakashan ancestral language has itself been reconstructed.
What would resolve this A specialist comparative-linguistics source (a Proto-Wakashan reconstruction paper or handbook chapter) stating whether, and how completely, a common Wakashan proto-language has been reconstructed.
OpenHistorical and comparative linguistics (Pacific Northwest Coast languages).Wikipedia: Wakashan Languages