I agree... giving up Tatum without a long term deal from AD would be absolutely idiotic and would set us back for years... Let's say that deal goes down and we give up Tatum and a combination of Smart/Brown/Hayward and multiple picks. AD comes and Kyrie agrees to an extension. After the season, AD sticks to his word and signs with LA as a free agent. I am sure Kyrie would then demand a trade... What would we be left with? Depending on the length of Kyrie's extension, we could be left with nothing. If he signs a one year extension, he could walk free as well.
If AD doesn't want to sign long term before the trade, then I say let him go (yes I know that means Kyrie will probably leave too), but at least we still have a young core of Tatum and Brown that we can develop and build around. Just my two cents.