I just finally gave up my AT&T unlimited data plan this year. Hopefully not foolishly I looked and our data usage was ~10GB and so we just bit the bullet and got a 16GB capped plan (which was actually cheaper to boot). Even with my new tethering obsession I’m keeping it well under the cap and with rollover data as well. Your usage may obviously vary, but in my case I was attached to the idea of the unlimited data but not actually taking advantage of it.
Just my two cents… it’s being discussed internally as well, but if there is any concrete news/plans for a standalone Cayenne server we’ll let you know via community announcement for sure.