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Virtual reality is really great, and I really hope, that there gonna past not so many years until humankind will make it possible to interact with it via websites... and as well, I just hope that ecommerce website development cost wouldn't rise up enormously, and so everybody could afford themselves to order one (with it's own VR environments, etc.)

Agree, ecommerce site development cost it will only fall over time. Many trends indicate this. Moreover, one of the prerequisites for VR to enter the mass market is to reduce its price for the mass user. Or raising the level of income. The first option looks more realistic.