Similar problem with XRAM. You need switches that can do the job. Opening switch technology at the ~1MA level has not worked correctly using plasma based switching i.e. gas switches. Solid state systems tend to have a problem with the voltage spikes from the switch opening and the pinch. Building large solid state stacks is possible but costly. A single component failure is enough to take out an entire stack. Advanced materials like silicon carbide or diamond might save the day but they are a few years off at least for the systems we are talking about.
