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Are Salesforce Lightning Components (Aura) dead?
No! Salesforce Lightning Components (Aura Components) are likely to live on for quite a few years. I do think that the Lightning Web Component will eventually lead to the Lightning Component falling out of use.
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Should I still be building Lightning Components?
There is no requirement right now to completely rebuild Aura components because Aura and Lightning Web Components can work together. They are completely interoperable.