Today a successful entrepeneur can go directly international, and with a client base that includes not only the US and Western Europe but also a huge (and quickly growing) middle class all over the world. This is several orders of magnitude the potential reach than 50 years ago. Successful entrepeneurs make billions not millions anymore.
So it's not absurd that we end up with more extreme wealth in the top .01%, and I think it is kind of structural to a modern, global society.
If we focus on the 1%, or rather the delta between the 1% and the 99%, I think we are rather observing skill supply/demand mismatch. In the US and Western Europe there is an oversupply of unskilled or low-skills labour, driving their wages down (relatively to skilled labour). So they will do worse than the more sought after skilled labour. It can partially be mitigated with better education. But part of it is also structural. Not everyone can be a good programmer or engineer. Unless we find a way to change IQ distributions, we may have a long term problem here that we may not be able to solve.