For me it's not about a "Wealth Tax", more that the wealthy (those with the broadest shoulders" need to be taxed more in relation to their disposable income. Recent years we've seen the rich get richer and the poor get poorer (relative to each other).
Those on ludicrosus salaries have massive disposable incomes. Does anybody thing that the CEO of Southern Water needs an anula income of £1.4m to cover his mortgage, holiday, food, heating, Council Tax, etc. And extra will be "invested" wherever the sought returns are and that is as easily overseas as in the UK - makes no difference where you live eg unfortunately a significant portion of my own savings are invested overseas).
So present system is some struggling using food banks to survive whilst others getting paid more than they (and their next generation and the next generation's next generation) could ever spend on any sensible lifestyle.
Not suggesting take all their extra cash,just they can be taxed higher and still enjoy fabulous lifestyles beyond the wildest dreams of 99% of the population.
Whether that is best achieved through wealth tax, income tax, capital gains tax or whatever is more a consideration of tax experts not the likes of me.
Also whilst it's sensible for politicians to establish broad policy eg those with broadest shoulders should pay more tax, best if tax experts come-up with best way to achieve than.
Ian