It's widely known that Verizon's "unlimited" is NOT unlimited. Verizon is 5 gigs a month, beyond which Verizon charges a per megabyte rate. The consensus I recall from discussions on droidforums is that Android phones are given an extra 5 gigs a month, making them able to do 10 gigs a month, but they are still soft-capped, not unlimited.
So, introducing tiers gives people more options, not less. There IS already a tier on Verizon now for something ridiculously small like 100 or 250 megs/month. So anyway, I don't know what the fuss is about. Only Sprint and Clear have "unlimited" unlimited and even they have "fair use" clauses so you can't go crazy.
Unless Verizon gets really greedy with the higher tiers and charge more than the current price for the current cap, this is just more options for less money for people who don't need 5 gigs/mo.
And yes, someone mentioned 4G... With 4G you could download 5 gigs in a few hours; something HAS to change with 4G coming at us. I've had the pleasure of trying Sprint 4G and where it works it is pretty darned fast. My highest speedtest was 8mbit download speed, with an average around 3-5.