As with much of the game, Natalia is on the back burner for now. From MoonBox we've learned that her situation is dependent on the return of Lily (or as I prefer to call her, The Grenade) Petunia's sister. She'll provide the necessary info about Natalia's husband.
So far, no timetable has been discussed here for when that happens.
Yes, it's been a while, for us, not so much in the game. We aren't even on 2 months in-game time. She's been waiting, but maybe not as much as it seems to us. While I would prefer to have it solved, if not for anything else so we could add that beautiful lady to the Harem, and knowing that Lily will come back (yummi), there's many other hang-ups in the game.
Things stalled a bit while the work into Part 2 was being done. Maybe now, things will pick up a bit and some of the "story" (as little as there is) will start to roll a bit faster. Hopefully NOT too fast.
I may be reading your words in the wrong tone, if so, I apologize. To me it seemed that you are putting a lot of your opinion of the MC on this ONE promise. It is your prerogative, obviously, but I feel it to be a bit unwarranted to do so to a 21 year old kid that out of sympathy for a neighbor offered his help, he may have made a promise, but I don't recall a time table for it.
Maybe it's just me, reading too much into your words. Maybe.
Peace