if you look at 093, it took 3 years. I'd imagine similar time frame for 09V.First Virginia took around 1 year and a half to be commissioned post launch while Seawolf took two years. So soonest we can except the first 09V to be comissioned in mid-2027 and latest some time in early 2028. Although that is just IOC, FOC will probably take a while longer.
The only rationale for that imo would be cost, but you sacrifice a lot of capabilities with that.IMO the true bigger question is whether 09IIIB will be succeeded by say, a smaller diameter (10m esque) new SSN (which is more economical, lower performing, but similar technologically) to complement the 12.Xm 09V -- or if PLAN will be bold enough to eventually go all in on 09V family once 09IIIB finishes production.
High low end of 09V & 041 makes more sense to me where the latter can replace all the SSKs eventually for missions within 2IC. And XLUUV replaces other SSK tasks.
09IIIB production and 09III retirement are really not related. The former needs to happen until 09V is in mass production. once 09V reaches dumpling stage, I see no reason why 09IIIB needs to continue.Production of 09IIIB may continue until all earlier versions of 09III are replaced.
Initial batch of 09V may comprise just two boats followed by evaluation period, another reason for keeping the yard busy with more 09IIIB.
Even for Russian/Soviet, Victor III continued production into early 90s.