Spreedly (non-core) customer here. Curious what these changes mean for existing customers. Your post is a good history lesson to bring everyone up to speed, but it lacks details as to how you're handling existing accounts... is Spreedly being deprecated?
Edit: Nvm, finally read the pricing page. Apparently, you're just switching to a metered billing where one of the meters is a payment gateway token. Also each plan-level now includes a limit to the number of cards on file.