333s are just modifed 332s (which were prototypes) so there is no way the 333s will last into the 2030s, I think the 333s will be replaced before then.Nothing has been mention about the 170 except that they ''Will be able to continue through the 2030's as will the 333''.
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Given 323s bodyshells are made of aluminium alloys the 323s won’t have long left in them, after all production on the 323s started in 1992.Even if you abandon the IT and cabling and strip right back to a bare shell you still have the limited lifespan of aluminium alloys to deal with, as opposed to steel's immortality.
I can see the 323s maybe making it to the 2030s, but who knows.