The Wright Brothers weren't the first guys to fly, they just made it efficient. Henry Ford wasn't the first guy to invent the automobile, he just made it popular. Both had their detractors and the detractors always pointed out with folk-lore wisdom the failures of the attempts before.
Note that there's always an element of the "Al Gore invented the Internet" un-researched cynicism. Dean Kamen is perhaps a little full of himself, but he never set out to hyperbole the Segway. That was mostly a couple of guys whom I believe are also Tesla Signature buyers, so I will respectfully leave their names out of here. And one marked difference is that after the Roadster was introduced there was no "is this all there is?" let down. Quite the opposite.
So I'm just going to kick back, save my pennies for the WhiteStar, and let history make a mockery of the nay-sayers.
(BTW, Al Gore also "invented" the high-orbit weather satellite, which got nixed in NASA budget cuts).