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Yeah, IPv4 is limited. On the other hand, as has been pointed out, NAT and subnetting allow for more efficient use of available addresses. Much of the currently available address space has been assigned wastefully. If ICANN ever gets off their collective butts and addresses that, we'll be fine.
IPv6 uses 128 bit addressing, versus the 32 bit addressing of IPv4. Adoption has been slow, but when it becomes necessary (which is likely to be many years from now, despite what the article claims) I have confidence that the switchover will be pretty painless. The number of addresses made available by IPv6 is not unlimited, but for all practical intents it might as well be.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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