Based on his reputation such as promoting "unhackable" hardware wallet & launching joke ICO, i doubt John McAfee would be a good president even if he favor cryptocurrency.
If US Presidency is in 2021, we can see one more proof whether he suitable as US president if Bitcoin price doesn't reach $1.000.000 and he fulfill his bet (eat his own dick)
I somewhat agree with your statement. He is one of the strongest voice of cryptocurrency world but that certainly doesn't mean that he will be a good president. He is very freckle minded and impulsive in taking decisions, a lot of his tweets prove that fact! But considering that a person like Mr. Donald Trump is the current president of US, anything can happen!
I don't think Mr. McAfee is one of the strongest voice of cryptocurrency. He only made an impact before but in few months only. People used to believed to him being a founder of a software company and a businessman. But later on people realized he is only about hyping.