There aren’t enough IPv4-addresses to accomplish that on the longer term. Already people are being put behind Carrier Grade NAT, sharing scarce IPv4 addresses with an entire street or district. Try to imagine what happens if many IoT-devices attempt to synchronise at the top of every hour from an ISP that deploys CGNAT (mine does). They resolve pool.ntp.org and the ISP’s resolver hands all of them the same IPv4 addresses (and never any IPv6). That is a lot of rate limiting kicking in on those poor NTP-servers (who only see one single CGNAT source address sending a lot of NTP requests). Not very productive at all, right? Now try to imagine that this scenario is likely to be a reality already today and it’s not going to get less in the future. Quit the opposite.