How does it help that they're in your basement? Are you using them for anything? If not, when will you know to switch to them?
What's the threat model and what would be your signal to go start using them and abandoning your presumably more modern system, and how would you keep the software on them secure? Will you use Gentoo, given that Debian has dropped PPC?
Threat model? Uhm. I think your asking me a bit too parameterized as I don't get your question. I will begin using them permanently of we get even more scandals. Also they are there as a fall back, but precisely for this purpose to protect myself against backdoored CPU architectures.
Ubuntu1604 works perfectly.
They are set up and ready to use.
I have Python 3.x and all other major packages ready for me to be productive with.
What's the threat model and what would be your signal to go start using them and abandoning your presumably more modern system, and how would you keep the software on them secure? Will you use Gentoo, given that Debian has dropped PPC?