That's my reasoning as well, regarding the biological part. On the one hand, it seems to be an incredibly energy-efficient solution, but has several detractors as well (in a lighthearted fashion: lack of scalability and high-bandwidth networking, several billion years of legacy code, etc).

On the other hand, it's unclear whether computers will continue to get faster in the fashion that they are today for long enough. If not, then huge efficiency improvements would be necessary on the software side, though those do seem to be happening as well.