The world won't change itself. If people did nothing 40 years ago, there wouldn't be a Free Software movement.

It sounds like you are not using a fully free distro anyway. Most of the popular distros contain proprietary firmware, so what's the problem?

Also if you care about security, install goddamn firmware updates. The firmware on the devices is only going to get more insecure. If the company wanted to insert a backdoor, they have done it already. If an attacker wants to attack your device, an outdated device is simpler to compromise using publicly available info than to go the expensive route through the manufacturer. The first doesn't even need to be a nation state adversary.
If you want to protect yourself against rogue devices, IOMMU and microkernels are a better and more sensible solution.