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They may be. There are certainly advantages to the helium filled drives. Of course, there is the manufacturing challenge of making them and ensuring that they don't leak, but that is certainly doable. One thing that I am curious about is the helium supply, just like Chris mentioned in his answer. It had been classified as a substance with national defense implications in the US, but it was decided that the US stockpile should be disposed of in 19XX, and this has resulted in periodic helium shortages and unstable prices. I'm not sure if this situation has changed or not, but a reliable supply of helium is a potential production bottleneck in the future.
Assuming that shortcomings can be overcome, the benefits should be able to override the increased cost in certain uses, such as the use in servers, for one example. More efficient storage is always a welcome development.