I feel like the current state of quantum computing is fairly safe because these powerful computers are in the hands of somewhat benevolent companies that have no interest in stealing bitcoins. As quantum computers become ubiquitous and more people start having them, that's when the danger gets more real. I'm not terribly worried about it today, but 5 years out..yeah possibly.

Fortunately, I feel that algorithms are being developed today which will theoretically be quantum resistant. IOTA is one example of a team working toward that, granted it's still all theory.

-Hive account@mattboyd