You'll still need boots on the ground once the poachers have been found and with increased success it's just possible that more guards would be employed if the system was effective and was able to attract more funding as a result.
The poaching syndicates are all armed with automatic rifles. The park rangers aren't trained to deal with threats like these. Our government has started deploying army troops, but the Kruger Park is so huge that it doesn't help much.
Any help, whether human or robotic, is desperately needed.
The original Luddites opposed technological advancement solely on the grounds that it would put people out of jobs. It's my impression that the modern consensus is that their stance was woefully misguided. However, it's precisely the same attitude that qompiler presented in the comment I was replying to.