Completely agree with this, OpenCascade is just not a good enough foundation to build a CAD package at the same level as SolidWorks or Fusion360. The unfortunate thing is that the level of investment to build a kernel of that quality is in the 10s or millions dollars. Without a corporate backer who wants it, it won't happen.

The only way I could see it happening is if a consortium of large companies decided that they wanted to drop the big players and build an open source one. It needs a visionary in the position to decide to do it.