What the biggest challenges facing industrial wireless sensors

What are some of the biggest challenges facing industrial wireless sensors today? We are planning to upgrade our wireless sensors and would like to collect some features users would like to have or upgrade, or change.
 
The biggest challenge is preventing unauthorized access by any hacker or government-sponsored organization or government entity. All backdoor accesses should be permanently closed and not available via any means, local or remote. Mitigating potential problems caused by EMPs (natural or man-made) is also a huge concern.
 
Interference, battery life, range limitations, security concerns, and data reliability are key challenges. User-desired upgrades may include better signal strength, longer battery life, increased range, enhanced data encryption, and improved data accuracy.
 
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