Surface-to-intrasolar-space propulsion technology in its to reach escape velocity is prohibitively expensive.

Currently, we use combustion. My instincts tell me that an “electro-gravitic” paradigm in propulsion is next.

Before that, we must have a revolutionary breakthrough or discovery in our fundamental understanding of physics.

Basically, we’re not smart enough and too low on the Kardashev scale to get a decent ROI on such an endeavour.