Sure, it would be nice to have much more efficient solar cells, but there's another issue keeping costs up.
It's the home infrastructure.
Right now, it costs more to install the solar cells on a roof than it does to make them, and once you add in the cabling and battery/storage system for balancing the load or for nighttime use, the actual power generating part of the system is much less than half of the whole system cost. Increasing efficiency is great, and will let you cut the overall size of the system for a similar capacity, but the big issue is making a solar system that's easy to install, with cheap storage, for a lot less.
Cheap batteries and inexpensive support systems are the things we need now...
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