If Atlanta is in danger of drying up if the shift is not made than by all means the shift should be made and there should be no more fuss from Tennessee about it especially since they already have surplus water from the river and do not really even need that piece of the border.
What in God's name do borders have to do with access to water? Several western states get their water from other states, and not just the Colorado river. Infrastructure built to transport water. So... It is a shitty excuse for expanding your borders. We will sell you some water for sure. Pay for infrastructure and it will be free, UNITED states. No, Atlanta is not going to turn into a death desert. Dumb.
I believe this is Georgia legislature attempting to jerrymander its way into more house members while weakening the power Tennessee has in the house (which is already quite weak). It is also unfair to the Tennessee residents living just north of the Georgia border and will ultimately lead to a disrupted tax system and infrastructure confusion between the states. The payoff is not worth the problems it will cause.