I thought Warren's tax plan was the wealth over $50 million. Meaning that if you were worth $51 million, only one million would be taxed at 2%, meaning $20,000 would be payed.
[0] Anecdotal, but that was the way to get an apartment for my parents' generation back in Soviet Union and I really don't want to see it here again.
I think most people would still be willing to keep working on stuff, and I don't see why VCs would stop investing in high-value companies altogether.