I think that's the biggest issue surrounding quantum computing right now. Well two big problems, the first being that it has no real-world applications that trump the user of a super-computer which suffices for what it does right now and isn't really something you'd even want quantum computing for. The second being the fact that qubits are highly unstable and to maintain something or create something for observation seems like its only practical use right now. The bigger problem with quantum computing as a science as well is the fact that its all just theoretical and while we'd like to think that most things around us warrant complexity of that nature they really don't just because of how we perceive them to bring some kind of stoical measurement into place.
Long story short, your i3, i5, i7, AMD variant would beat the shit out of a quantum processor if you tried to use it for daily tasks which is why its where it is, in theoretical science space.