If Kojima wants to retcon anything he can just go ahead and retcon EVERYTHING about MGS4. That'd be great.
The flying platforms were based on these. Seems totally legit when you take into account the prototype nature of tech in the MGS universe and the general wackiness of the series.
http://en.wikipedia.org/wiki/Hiller_VZ-1_Pawnee
http://en.wikipedia.org/wiki/Williams_X-Jet
I see what you're saying, but those platforms were hauling ass at like 40mph in the jungle motorcycle chase. Aside from the fact that many were bumping into trees, that's REALLY advanced stuff. If we had those things today, even with a high fuel cost you better believe people would use them.
The flying platforms were based on these. Seems totally legit when you take into account the prototype nature of tech in the MGS universe and the general wackiness of the series.
http://en.wikipedia.org/wiki/Hiller_VZ-1_Pawnee
http://en.wikipedia.org/wiki/Williams_X-Jet