It’s a bit like if Martin Luther King became the dominant meaning of the word “King” and that became the reason “King” echoed down the centuries; famous things named after him so that everything King which isn’t named after him is often thought to be, or is a reminder of him.
Nowadays "Hitler" is the default bad guy but before him it was "Napoleon" in much of Europe, and before that "Pharaoh". I'm pretty sure the same will happen to $DEFAULT_SMART_GUY
Einstein's association with nuclear energy will be what keeps his memory alive.
Don’t worry, the same will be true of kardashians, probably sooner than It happens to Einstein.
But this is a silly point I'm making, I admit ;)
but most people recognize the formula E=MC^2 even if they don't know what it means, and can tell you the name of the dude sticking out his tongue in a picture.
Understanding someone's work is orthogonal to them being well known.