What's not a fad is getting devices to communicate their health and status to an upstream repository for things like predictive analytics.
This is already happening in the B2B sector. It will reach the consumer sector next, but like you said it will take 2-3 consumer product cycles to make it real.
It won't be about remote control or any of the barely useful use-cases you're seeing with fridges and door locks and water bottles. It will be knowing your home's A/C has two weeks of operation before it seizes up. It will be knowing your home's plumbing has frozen and burst while you were away.