Worth changing L640 for L950 at present time or wait?

Reading all those things about Windows on ARM, cloud version of W10 and the generic idea of Microsoft replacing Windows 10 mobile for something else I was wondering if it's right to buy Lumia 950XL to change my (beloved) Lumia 640. I know we have to wait for a long time to see new windows phones but I wouldn't like to buy it and after some months stop being updated

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