You dumb asses, Google.
I use a Nexus 5 but I don't have a data plan since I'm near WiFi most of the time (plus I don't feel spending $30+ just to get a data plan). However, I loved having the capability to get SMS whenever an event was added to my Google Calendar (by other family member, for example).
So, Google could have justified this move by saying that sending free SMS is costing us an arm and a leg, and this is a cost-cutting maneuver. Instead, they are hiding behind "oh everyone has a smartphone these days".