Prediction
If this passes in the Netherlands and becomes tax law to be enforced, the financial industry friendly banks will come up with products that allow retail investors to invest in such a way that the tax issue will be taken care of at the fund / ETF level (for a small fee).
Too bad that the previously savvy retail investor investing directly into companies (or funds / ETFs without such a wrapper) will be left standing in the rain, but rest assured that the professional asset managers will find a way around this and mostly remain unscathed.
If regarded as too political, please feel free to move this post to the censored pile as well. /s