One of the many drawbacks of TLAM as a strategic asset is that it's a bit slow. Three hours is plenty of time to get away from a target area if you are a half-decent mad dictator, as opposed to half an hour if a big boys ballistic message is coming at you.
The limited range of TLAM means that to hold the important target set at risk you have to get quite close to your oppositions coast and their ASW assets. that also means you'd have to have the three at-sea boats sitting in close. Everybody seems to assume that the target set is I'm a Dinnerjacket and Uncle Kim, whose capitals etc are relatively speaking close to the coast. That may be the case now, but in 20 years time when these boats are entering service??
Also, these enhancements to defeat AAW systems are often based around GPS which in this case really is controlled by America.......