I could pick apart your list if you really want but the crux of why I would say "No it's no viable as a MMORPG in the long term" is that the majority of your points are single time things.

You only do the main story once ect.

There is very little in the game itself that is going to drive a person who wants to keep playing once they hit their personal end-goals. I have a feeling many people with their Relics finished for example see a dramatic downspike in their in game activity now that they have accomplished their goal, they have nothing else to strive for.

I can expand upon my point further is so desired.