10-15 years? You might be a little optimistic, methinks. Granted, though, there's still around 25% or so of the address space unallocated. I think your problem is mostly related to how ICANN treats RIRs other than ARIN. I usually don't have a problem getting more IP space fairly cheap (or free). In the US, there are many ISPs that cater to "power users" and don't assume their users don't care about how many IPs they have.
Fortunately, the global IPv6 network is getting a lot better, especially in the US and Europe. Large networks have already deployed them, and the number and quality of the peering arrangements over IPv6 have gotten a lot better only in the last two years. Unfortunately, there still remains the major question of how to bring it to end users. I've had IPv6 access since 2000, but what kind of work will a normal person do to be brought onto an IPv6 network?
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