Maybe(in 10-20 years) We'll build analog imitations of the brain , with similar density and high power efficiency.

Or maybe we'll build other types of compute machines using analog electronics.

Maybe we'll replace digital multiplies with pseudo digital multipliers that use analog computation the background, and with other forms of non-exact computation.

Or We'll use photonics to analogically compute FFT's to multiply matrixes.

Or maybe we'll finally seriously and successfully invest in optical digital computing.

Or we'll crack quantum computing.