File this under non-issue. Just like 720P vs. 1080P, most people, when not told beforehand, can't tell the difference. Yes, a few people with exceptional eyesight and experience with both technologies might be able to point out the difference, however, most people will never know. Especially your average consumer, who doesn't know what AMOLED or LCD even mean.
Besides, everyone agrees the iPhone4 screen is good, and that's LCD, so don't discount the tech just yet.