The message of the New Spirituality is freedom, and that freedom is the essence of who we are as beings, then such a system of coercive taxation will be rejected as inappropriate.
In its place will be a system of voluntary sharing—a regular contribution of personal income.
I see in the future is a system like this of free-will sharing of income from all sources—the same contribution, percentage-wise, from everyone.
In tomorrow's completely transparent society there would be no need for cash. All payments for everything will be made through a C&D Account, the simple process of debiting one account and crediting another. There would be no mandatory tax of any kind.