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I don't think so cause replacing a hardware memory completely is not possible .. And if at all u think of doing it for that u need 100% net connectivity .. agreed in India after Jio has come net speeds have increased but 100% connectivity is not possible here in India at least and I don't think till 2020 already it would be 100% there .. so cloud storage replacing external is tough .. and external storage is one time buy but for cloud storage u need to pay monthly or yearly like we pay rent which might be annoying for some people ..
Definitely, because cloud storages are not safe. It is cheaper than external storage. But our data's are on some others hand. We don't know how they keep our data's. In future people's will realize this security problem