No aggregate speaker total is published because Algonquian-Wakashan is not accepted as a genuine genetic family; its putative member families (Algic, Wakashan, Salishan/Mosan, Kutenai) are enumerated and counted separately in the literature rather than as one unit.
What would resolve this A source treating the grouping as sufficiently established to publish one reconciled total across its proposed member families, which none currently does.
OpenHistorical and comparative linguistics, North American languages.Wikipedia: Algonquian-Wakashan Languages