Individual coherence makes collective incoherence.
It is logical to not migrate as it costs and nobody uses it yet (but me). It does not
add a think to your service, except if your end-user is a technical one (that for some reason, want IPv6).
However, the logical "not migrate" movement creates a great incoherence when it introduces
extra costs in order to overcome the lack of IPv4 when bad times comes.
At that time, CFO will start to worry when the cost of IPv4 get skyrocketed.
So, if you migrate now and nobody does, you gain nothing. It only costs.
If you do not migrate now and everybody else does, you gain as you postpone
an investment without immediate return. When you migrate, it will be easier and cheaper.
Now, it nobody migrates, we get doomed.
Who migrated until now are just people that like new technologies because they are new, even if they are worse.
I migrated to IPv6 but it introduced extra lag as my ISP does not provide it and I'm using a tunnel.