If you showed some people a sketch of something like a Ventum triathlon bike they would probably say it was wrong or fake. The shape of bikes has been held back for too long by tradition and outdated UCI race equipment rules.
There are different formulae for road cycling (governed by Union Cycliste Internationale), triathlon bikes (International Triathlon Union), and "human powered vehicles" (International Human Powered Vehicle Association), typically recumbent and with fairings, and others.
Top speed (undrafted) for HPV over a timed one mile is 78 MPH.
http://www.whpva.org/land.html#220
https://en.wikipedia.org/wiki/Racing_bicycle#Distinction_bet...
Designs are changing, but gradually. Most kids bikes now have non trapezoidal frame designs. But metal tubing is still a pretty compelling material to make a mainstream bike from.