Not really.
The stability of number in IPv4 as compared to the monotonic rise in IPv6 is what I find to be curious.
I think the fact that RIR's allocate very large IPv6 address space
to their members may well be what is driving this.
Historically, network operators do enjoy de-aggregating address
space. One can get significantly more /48's out of a /32 (or
shorter) than they would /24's out of any IPv4 allocation they
acquired.
One way to control this escalation is to shorten the maximum prefix
length that all operators are willing to accept into the DFZ. The
other way would be to get RIR's to lengthen the minimum allocation
they can make to their members. Neither of these solutions is likely
to be popular, but nor is having to pay large sums of money for more
FIB.