Reg Nuclear subs, I don't think we are getting 7 SSBN. As of now there is no plan that exist in public domain that goes beyond S5. Considering S1 is shore based Nuke reactor, we might end up with 4 Boomers. S2/S3 with 4 silos, S4 with 8, S5 with 12 or 16.
Jalashwa would soon be retired. Hope...