My RPi::WiringPi is based off of this, as are a few of my near two-dozen supporting RPi:: distributions for sensors, communication protocols (serial, I2C etc) and other peripheral devices on my CPAN. With that said, over the past couple of years, I've weaned away from the wiringPi library in several of the distros, instead re-writing the code in them with custom replacement C/C++.

It's unlikely wiringPi is going to just up and die. Although I'm not aware of a single coordinated effort to keep it going, there are definitely other mirror repositories out there and people are continuing to move the software forward.

I really hope that wiringPi doesn't completely go dark (I can't see it honestly), but if it does, I've been working on ideas to ensure that RPi::WiringPi (and its base, WiringPi::API) will continue on.

Note that there's currently RPi::PIGPIO, that uses the pigpio library (which is not related to wiringPi), and hence, is not affected by the deprication as far as I can tell. I've never used this software myself, and haven't had a look at the source since it was really first released.

I've also recently contacted Gordon about getting access to his most recent revision of his git repo before he took it offline.