D-wave achieves 5000+ qubits by networking a bunch of quantum computers together into an aggregated cloud platform. It is marketing speak, but its also true at the same time. You are able to leverage that total aggregate quantum processing power.

Quantum computing is good a specific data aggregation and predictive analysis tasks. It's best utilized when using a traditional computing system with it, so you get the best of both worlds. Basically hybrid processing, you let traditional processors do what quantum does poorly, and let quantum processors do what traditional processors can't. That's what D-Wave's market is focused on.

A good example, is Google used quantum computers to design algorithms for eye detection with Google Glass. Quantum computers have some really interesting use-cases when analyzing massive amounts of data. But ultimately the software to do much more with them literally doesn't exist yet. We're barely scratching the surface of what quantum computing is capable of, and again the more logical systems are going to be hybrid systems in the future that leverage both quantum processing and traditional processors in the same IO.