I only skimmed read posts but from that what the arguement here is whether VF should hold you to a contract in light of the new plans launched. Legally they probably have every right to.
What I think those here that feel hard done by are wanting is some sort of goodwill from VF for their loyalty. Without looking at the impact financially to the company I am going to guess that if they allow those on existing contracts to move to the new plans without penalty then they would be losing money, it's the only explanation.

If this is the case then what they are doing is securing a limited income from these customers as I am sure a percentage will leave at the first opportunity and it appears that when TC get their GSM network operational many will move. I read that some are willing to sign up to another 12months on their contracts just to get to the new plans, this seems a reasonable compromise.

What I find interesting is that in the last 3 pages of this thread there seems to be a lack of attendance from the OP VF official voice. I would be interested to know whether this is deliberate as things have gotten a little hot here. Of all places this is where VF should make a stand, either make allowances (surely it would be in their best interest in the future) or stop this arguement right here by saying - it aint going to happen, get over it.

On a general note, both major mobile companies seem content to let churn happen as long as it appears to be even. I have no idea what the numbers are but I am going to guess that the flow both ways is even. If this is correct then surely VF should be doing a bit more to keep customers that are loyal to GSM not VF.