The following article might be interesting in this context (though it mainly concerns itself about SSBNs):I actually think the PLAN might get into SSGNs in a fairly big way.
That exponentially increases the defensive burden of the USN, meaning they need to leave significant assets to defend their home bases and/or try to hunt down PLAN SSGNs.
Sometimes the best defence is a good offence.
It argues that geography (and alliances) makes it easy for the US to place listening devices at the chokepoints that chinese submarines need to pass to get beyond the first island chain into the pacific and that this would allow the US to keep track of chinese submarines and follow them.
If this is true then I think that investing in SSGNs that are as big as SSBNs and operate similarily (rely on stealth to hide out until you attack) might be less successfull than operating a bigger number of smaller SSNs that can also use cruise missiles.