"The shunning policy along with the blood doctrine and a stone-aged 2 witnesses rule cannot just disappear overnight."
The problem that I have with the organization is that they are pharisees. They have added rules where they are none.
The law on blood is only found in Genesis 9:4. It contains nothing on the medical use of blood. The governing body adding that makes it their law and not God's law.
Disfellowshipping is completely from the apostles with references back to Israel under the Law. It is all about the congregations rather than anything from Jesus.
I'm not opposed to the two witness rule. Considering that the 9th command says to not testify falsely against someone and there are many other laws showing that Jehovah knows that humans lie and commit perjury against others shows that it is needed.
And considering Blackstone's ratio "It is better that ten guilty persons escape than that one innocent suffer", was a legal principle since 1760s, the two witness rule is necessary.