No, that was never proposed, on the cards, or even desired.
Some purposes of an offline mode are:
1) To be able to pause the game at any point & the universe stops
2) To be able to save the game at any point, come back to it two weeks later, and it still be in the same time & space.
3) To be able to play where there is poor or no internet.
4) To be able to play when the servers go dark.
5) To be able to forward plan when you can't be online 24/7.
Those are five of the positives. It also avoids a number of negatives, such as:
1) Galaxy moves on without you.
2) Your game can be affected by idiots or people who can afford the time to play the game more than you.
3) You can get ganked or smack talked by idiots.
Now, out of those, only ONE of those is covered by SOLO-ONLINE (i.e. what we've got, what we've had since the start of beta, etc). For everything else, you need OFFLINE.
I add to this good list, all true and all too real, another offline-only feature: modding freedom.
There're games that live on their extreme moddability and the rich community ecosystem that ensue.
Even if it's more than 12 years old, I still keep a copy of NWN installed to play it from time to time, thanks to the enormous amount of mods that were produced.
I bought and re-bought it in various formats 4 times, the last to buy the DRM-free all-in-one version from GOG.
Same for NWN2. Most Bethesda games. The Civilization series. *Oolite*.
There were plenty of reasons for wanting an offline mode... Oh, well... moving on... see ya to all!