could someone get off from their contract should this tier plan go through? I don't think i'll stay with verizon if they do.
Generally speaking, no. Usually the only way you can get out of a contract is if the other party modifies it. I've not read the phone contract in detail, but I studied enough contract law in college... If VZW would try to modify existing contracts, then generally accepted practice is that they have to offer you the option to accept their modification or cancel the contract without penalty. If they simply forced the change to you without an option to leave, they are in breach of contract. (Again, they may have fine print that I haven't read... just basing this on typical accepted business law principles)
I'm not thrilled... but I'm also not surprised. I travel a lot for business. And if you'd have asked me 3 years ago if I thought I would be paying for every piece of luggage I take on the plane, I'd have told you that it was highly unlikely. Yet now look... once one industry leader "steps into the water" and the others see it being profitable, they all follow suit. (Kudos to Southwest Airlines though, my bags still fly free!!) Anyhow, it is the same in the wireless market. ATT tested the waters, now it appears that VZW will probably follow suit. And don't be surprised if other carriers jump in. The bottom line is that corporations have to turn a profit for their shareholders, and if this decision will help that bottom line, then that's what they are gonna do. They weigh the numbers and when they announce a change (just like the airlines) there is a planned percentage of customers who will leave, but the anticipated revenue from those who remain is expected to offset and exceed whatever was lost. Businesses don't go into these kind of decisions without a bunch of paperwork to prove the profit. When the change goes live, the paperwork gets tested. Sometimes it proves wrong, sometimes it's proven right. Only time will tell.
As for me, my typical data usage on my old WinMo phone was around 200 megs a month. When I got my Droid, I jumped to about a gig per month. The phone does make a difference. As long as they charge a reasonable amount for 2 gigs a month, I don't mind it. I may even be able to make my bill a little cheaper in the long run if I manage my data usage properly.