Some researchers are predicting that the market for "universal" quantum computers that do everything a supercomputer can do plus everything a supercomputer can not do — in a chip that fits in the palm of your hand — are on the verge of emerging. This would mean "quantum dominance". This is where quantum computers exceed classical computing systems. What happens after quantum dominance ? Quantum computer power scales far more than classical computer systems. Doubling the qubits can bring thousands to millions of times more processing speed and capability. 

The specialized qubit processors from Dwave are at 2000 qubits and they double the qubits every year. Dwave is also looking to make a substantial redesign to their systems. 

Schoelkopf, Quantum C ircuits (Researchers from Yale) and Rigetti's group (University of California at Berkeley) are trying to develop 50-100 qubit universal quantum computers. Such computers could outperform supercomputers.