There are limits to what they can change without incurring large redesign costs or shifting to more expensive parts that would cause up-pricing the next version. Yes, they can switch to honeycombed plastics to lower the weight, or they could make a finer grained Fresnel lens, and a better strap system at approximately the same cost. But, unless the price of smaller higher pixel density OLED displays has gone down, that is not going to happen, nor can the Vive be flattened much because that would require fancier lenses.
I am curious about the display because the Chinese eyeglass HMD does have much smaller, much closer to the eyes displays. If they have also achieved decent tracking then I would get that one instead of the Vive.
HMDs are not new to me since I did a lot of that back in the last VR wave, so the allure of this wave is, to me, not compelling until sufficient refinements happen both in the HMD and human input controllers, and in the virtual world software.