I direct you to this passage out of Batman Begins:JemJar said:Tech Level Error
Fact 1) Humans are capable of biologically constructing, in tanks, completely functional creatures which they can control remotely, seemingly without lag, over a suitable distance despite signal losses and noise.
Fact 2) Humans still send infantry into the field and control their war machines (both airborne and walkers) by putting people in them and putting lives at risk.
If your biotechnology and signal processing technology is enough to make the Avatar programme even possible from a control point of view then there's no way real people would be put in the field, unmanned aircraft and tanks/walkers would dominate.
Fact 3) Said warmachines are mechanical not biological.
If your biotech was of a level capable of constructing entire functional organisms from DNA you can bet your ass that the first thing the military would do would not be "make fake aliens to talk to the aliens" it'd be "make me a humanoid body as big and strong as an elephant"
Fox - Here we are. Nomex survival suit for advanced infantry. Kevlar biweave, reinforced joints.
Wayne - Tear-resistant?
Fox - This sucker will stop a knife.
Wayne - Bulletproof?
Fox - Anything but a straight shot.
Wayne - Why didn't they put it into production?
Fox - Bean counters didn't think a soldier's life was worth 300 grand.
This isn't directed at anyone specific, but it seems like a lot of everyone's "plot holes" are due to people not paying any god damned attention to the film. My Avatar review may help explain why! http://www.escapistmagazine.com/forums/read/326.164452