This post earlier in the thread indicates that the money received by private schools in 2016 was approximately $151 million dollars, out of a total education budget of nearly $9B, or 1.6%.
According to DionTheDman, 39,000, or 5.26% of students in Alberta attend private schools, out of a total student population of ~745k.
Assuming the budgetary ratio has remained consistent, eliminating the funding for private schools would result in an increase in funding of ~$160 per student, or enough to accommodate another ~10k students... Hopefully enough to cover the potential exodus from the private schools.