Heh; Doc Smith never had a character's story end with marriage. The Seatons got married in the first book (of 4), and Dorothy doesn't seem less important in later books (she's not that important in ANY of the books). And of course Children of the Lens is about Kim and Clarissa's children when they're grown up (and their parents are still very active, in fact Clarissa is more important in that book than any of the others).

But then he somehow seems to avoid most criticisms leveled at SF, except for the one of being sneered at by the literary elite.