I understand Corelle is considered the same as glass. Can we get by with one set of Corelle dishes for both milk and meat as long as we don’t eat them together?
The Halacha clearly states that even cold foods require different dishes for meat and milk. The same holds true for actual glass dishes. So to answer your question, yes, you would need 2 sets even from Corelle. The only leniency is for drinking glasses. The custom is not to necessitate separate glasses for milk and meat. The rationale here is that meat is never placed in a drinking glass and so it was not included in the decree.