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I would not be surprised if our standard #IPv4 peters out over the next decade or two. There are already multiple layers of work arounds (such as NAT and CGNAT) that make certain things more difficult than they should be.
I wouldn't be surprised if an "IPv4B" comes out (basically the same thing, but all existing addresses are prepended with "2.2.2.2", leaving a much larger address space for future expansion. This IPv4B would likely run alongside IPv6 ... but would require software upgrades across almost every network attached device and hardware upgrades to routers and switches globally.