Those are not the only trouble, there is actually more. EM guns will not be feasible for sometime, but when the time comes we should be ready to adapt to it.China’s long range missiles would not allow them to be that close. Although Zumwalts are “Stealthy” , it is not feasible to continue with this technology further for the sake of 3 ships
Issues to start with;
Electricity demand,
Magnetization of the hull,
Guidance of hypersonic munitions,
Consistency of firepower,
Maintenance interval and cost.
DIRCM is good to start with in my opinion.