The good news is that not all that '1% of the rich' are leaving. However unless this 28% of all tax figure is wrong, inevitably there will be an increase to counter the loss.
The outcome is not as clear as you make it to be. The Norwegian wealth tax hike resulted in a loss of about $600mn of tax revenue. We will see at which point the british will end up on the laffer curve.
https://fullfact.org/economy/do-top-1-earners-pay-28-tax-bur...
The good news is that not all that '1% of the rich' are leaving. However unless this 28% of all tax figure is wrong, inevitably there will be an increase to counter the loss.