Alternatively
"No one else seems to care, sniff politicians
Maybe the problem is that, unlike politicians, the telcos know enough about the subject to be aware that changing SS7 would need to be done through the ITU, be agreed upon and accepted by member states, be implemented by vendors and that the end result would still need to be backward compatible with what's deployed now.
There's a whole stack of players involved that really don't give a shit about what the DHS and FCC think, much less US politicians - in fact, there's probably a number of involved parties who would be likely to oppose any proposed changes for no better reason than the US wants them. Being a Muslim or Russian does not disbar a country from ITU membership.
Biting the hand that feeds IT
