If Verizon really wants to get rid of unlimited data that badly, why not just yank it away. All of the contracts have expired for those with unlimited. There is no law that says they have to grandfather your plan.
There's no rational answer to this, coming from a holder of 53 UL data lines on VZW's network. It's cheaper for me to "just pay the bill" than pay a guy to monitor my employee's usage, pay an accountant to bill usage per client, and log in-and-out of my 6 accounts to monitor and adjust data use, anticipate next month's data usage, etc., etc., etc.
I don't qualify for a corporate-liable account - I'd need 80-100 lines. So, what VZW is facing is me taking 45-50 of my lines to Cricket or GoPhone - similar coverage for my region and losing $4000 per month of revenue. A few of my friends and I met over the weekend to see "what works for them" and they're all on GFed VZW UL data lines. We don't abuse the data, but VZW is forcing us to re-visit our bottom lines - ATTWS-based MVNOs are cheaper on the bottom line (not including overhead), offer similar coverage, and are about as easy to deal with on the phone - and, we can re-use our unlocked VZW iOS devices.
If VZW would yank our lines away, they'd lose about $20k of business from me and my friends - tomorrow. I'd keep one or two of my VZW lines, but go GSM with everything else. I'd still lose money because of my having to micromanage everything.
IMO VZW needs to cut off the users that use 100GB to 500GB of data each month, braggarts that spout off on forums like Howardforums. Even if I was a guy with 2-5 lines, having to check my bill for my kid's usage would be a major PITA. Data costs less than 20 cents per GB - delivered. VZW has gone on the record indicating that LTE is 6 times more efficient than EVDO. VZW has sold several billion dollars of unused lower block spectrum to ATTWS, USCC, and TMO - but our bills don't go down. After seeing the $4.3B reported as profit by VZW this past quarter, I have little empathy for them.
None of this is directed at you. If VZW cuts me off, I'll cut them off. And three of my four friends, all small business owners (170 lines between us), will do the same. Simple as that.