Re: It's time for a re-write ...
... throw the current taxation system out of the window, sit down and define a new one ...
Has a look outside, no there isn't a porcine aerobatics team practicing anywhere nearby :-)
Such a change can't happen. For any mass change, there would inevitably be losers as well as winners - and those lowers would "be unhappy about it". Large numbers of "unhappy" voters means "looking for new job come next election time".
And as pointed out, there's a large industry out there that makes a living from two aspects of the tax system - one being that most people don't know enough about it to do it themselves (so "bread and butter" work for accountants doing tax returns etc), another being specialists in tax minimisation (ie knowing the little details that can be exploited to avoid, not evade, tax).