Depends on implementation. For example, a wealth tax that has a "cap" at some ludicrous amount of wealth, like $10M, would effect very few people and therefore be insignificant for the average worker. So 99% of people would continue saving with no change at all to their behavior. The externalities could be nice though, since it'd distribute capital more efficiently. Sort of a general stimulant to the economy.

This line of thinking though assumes it would have no impact on the largest players though. It hinges on a "calling their bluff", that high NW individuals won't change anything despite now being forced to annually liquidate assets to cover taxes. And this doesn't even touch on the immense impracticality of annually valuing assets. Or how to manage assets in illiquid markets, or how to sell 30% of a painting to cover 1% of it's mark-to-market value by year end.

The reason wealth taxes never go anywhere is because when you sit down and learn what wealth is, how it works, and what is practical, it makes the most sense by far to just tax things whenever they go back to cash.

Really the only genuine tax loop-hole is the step-up basis on inheritance. Everything else is just an elaborate deferral to pay taxes later.