As far as I can tell, the previous rate limit of 1 per second (60 per minute) hasn’t caused any major problems for StreamLabs, Muxy, NightDev or other services. More than likely, they have multiple connections to the Twitch API spanning across multiple IDs and IPs, giving them more breathing room. The 120 per minute limit + having information returned about how much is left would be more helpful to them than a hindrance.
That being said, WebHooks will be a bigger boon for those services in the long run