Apparently, there's a team at MIT that's looking at a way to overcome the two-qubit gate problem by drastically reducing error rates. Here's what the team has said:
This is a major step on the path to more accessible, practical quantum computers. Is anyone here familiar with the other problems that quantum computing faces?“We have now taken the tunable coupler concept further and demonstrated near 99.9 percent fidelity for the two major types of two-qubit gates, known as Controlled-Z gates and iSWAP gates. Higher-fidelity gates increase the number of operations one can perform, and more operations translates to implementing more sophisticated algorithms at larger scales.”