Nothing says "the future" like 1970's style costumes!
We mock '70s styles now, but our kids will be mocking '00s styles just as gleefully. Fashion shifts so much that it's impossible to say that one decade's styles are any more "futuristic" than any other's.
And I don't see what's specifically "'70s style" about the TMP uniforms. I though the fashion sense of the '70s was dominated by garish, flashy patterns and exaggerated shapes, and the TMP uniforms couldn't be more opposite to that. To me, they seem quite functional and plausibly futuristic. Certainly more so than those ludicrous retro costumes from TWOK and beyond.