I would in principle be OK with ending income tax if we could still reasonably provide for basic infrastructure, law enforcement/justice and education.
Estate tax is harder, because the way the US and to some extent world economy is setup, massive wealth is a "multiplier" making it much easier to accumulate more wealth. It's reasonable to say someone "earned" an income accumulating 5, 10, 100 times the average citizen. However when you have an individual who "earned" 100,000 times or a million times the average citizen and passes this money along you are creating dynasties that continue to use this money, not unlike the feudal societies of long ago. The later generations certainly didn't "earn" the money. They continue to use the multiplier effect to control the system and make more money.
If we could change that multiplier effect it would be fair to abolish the estate tax.
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