I think it goes beyond that. We also know that only a handful of Japanese surgeons will be offering it in the beginning. So even if you can afford it, it's likely you will be faced with considerable wait times. I mean, normal transplant surgeons can already be backed up for months; imagine what it would be like if they can offer limitless hair with precise control over its properties?
Years. Impossible to give an accurate number, though.
When Riken launches their product, they will basically have no competition. None of the other "hair cloning" endeavors are as close nor as sophisticated. It also takes several years for patents to expire. Because there is no one offering a lower price, there is no reason to lower the price and who knows how long it will take to automate the process.
Some also argue that the price may never really drop and have cited other common plastic surgeries remaining at ostensibly the same general price point (or at least "expensive" by some definition) despite having been available for a long time.
Cosmetic surgeries, including this one, are a specialized surgical skill and the thing about selling skills is that they have no theoretical limit in what you can charge. So it's not like buying a product that can become cheaper to produce over time...at least, not for the foreseeable future.