This is a really weird argument. They are a company supplying a service, why should they ever have to shoulder the bill?
I'd argue that if things stayed the same, this small company would subsidize you: if you have 100 accounts using 1 repo it's more likely you're using more resources than 1 account with even 1000 repos :)
Edit: My parent post is being down voted and that's fine, my point was not made in anger, it was an observation that smaller companies are having their monthly costs decreased, and the larger companies are seeing an increase, for organisations created after today that's a fair premise, but for those organisations that have been using GitHub for years and have now seen their monthly costs increase, it's a slap in the face.