This same tech was on the cover of a 1971 IEEE Spectrum magazine. I don’t see any advancement since then.
Still doesn't make any sense because alternatives, like ground based solar and wind have also advanced considerably.
In fact, if you use the best available alternative source of electricity as the benchmark, it's regressed noticeably since the 1970s.
It will likely have to be assembled in space from materials mined in space to ever work out.