IBM is scheduled to launch quantum computers sometime in 2018 for home users. Idk how much they will cost but definitely worth considering. Nxs is working on quantum resistant 3d chain with decentralized internet via cube satellites. Very interesting project. I believe bts can also be upgraded easily to protect against quantum but not sure. For those reasons I’m accumulating bts and nxs. Just thought I would share as I too am concerned with quantum security risks.