Fallout is far from dead. Just accept that we won't be getting a good official title and you'll find out.
We've got three official games (1, 2, NV) plus Tactics if you aren't picky.
Then there're also hundreds of mods for New Vegas (varying quality, though there're some really good ones).
There're also total conversions and a fan game.
New California's main plot writing isn't that great, but it really shines with it's reactivity. Gameplay is standard Gamebryo though.
Resurrection follows Fallout 1 formula rather closely, but it's quite revolutionary with how it's companions are written. Not to mention that Bad Karma options are among some of the most disgusting shit I've seen in the whole franchise. It also has a wide range of the craziest sexual encounters.
I would describe the entirety of Nevada as an evolution of Fallout 2. The amount of reputation perks, traits, stat and skill checks makes it a great experience, with each playthrough slightly different. Did I mention that they made EVERY SKILL in the game useful? (even gambling!!!)
Not to mention that re two more on the horizon- Mutant Rising and Sonora!
And the translation for Olympus...
If you somehow got through all of it- you still have Fallout-like games.
ATOM RPG is the closest to Fallout among them, while still doing it's own thing. My only complaint against ATOM are some balancing issues (e.g. Speech is even more overpowered than in Fallout, as you can talk your way out of random encounters with hostile humans).
Underrail focuses more on combat (which is really great), but also has the best stealth system out of any RPGs I've played. Your social skills and Intelligence also have lots of use allowing you to play whatever way you like (you can finish the game killing 3 humans). It also has a really interesting world you'll want to explore in it's entirety.
Age of Decadence is more focused on high replayability and in order to achieve that it takes away a bit of player's agency, which can be annoying to some. Fun combat system and interesting world will keep you glued until you do at least 8 playthroughs.
If you still want more- Wasteland 2 and upcoming Wasteland 3. While more combat focused, Wasteland 2 is a fun experience that I can recommend to everyone(we'll see about 3).