Well, if quantum computing advances fast, this can mean the end for Bitcoin, right? However, for now, the field has been taking baby steps, and whatever Google has these days, it cannot be a problem for Bitcoin. It's also unclear whether it's a matter of time till we have an awesome quantum computer or whether it's impossible in principle. It's like the strong AI question in this sense. But anyway, it seems that even if quantum computers destroy Bitcoin one day, they won't destroy cryptocurrency, because even these days there are already projects working on quantum-resistant cryptos (although I don't understand how it works).