this will cost between 10800 and 36000 and its possible this could go down to 7200$ as the bigger a ssd gets the cheaper it gets too. i think the shere amount of ssd storage out weighs the fact its a pcie card ssd, so you probably also wont see the price hike associated with it.
i dont believe the consumer side will see this for quite a long time, at least not withing the next 4-5 years space or speed wise. so it could be a good investment