Not looking forward to basically a 100% increase in my bill when Verizon pulls the plug on the grandfather unlimited plans.
From Verizon's perspective, if you pay their post-pay rates and bring your own iPhone, you're paying them an additional $18+/mo since they don't have to cover the subsidy. As such, if you have a grandfathered plan, they care less since you're basically paying for a higher rate plan by not using a subsidy.
UPDATE: I should also add that if you buy an factory unlocked iPhone from Apple, there is no way to activate it on any CDMA network. CDMA is inherently a locked network.