None of the reviewers have even upgraded to Nook'n'Go yet. Stop panicking. If anything, I get the feeling New Horizons is going to have a slower and longer grind than New Leaf.
Whoever says "end game" in Animal Crossing clearly doesn't know the franchise so I wouldn't worry too much.
As much of a “go at your own pace” game Animal Crossing is. It could be argued that after a certain level of completion, you’ve reached end game.
Yes, but reaching end-game after only 2-3 weeks of playing? Doesn't seem likely.
Plus let's not forget the updates that these players wouldn't have been able to have in their game.
I think possibilities are endless here and I trust that Nintendo would want us to experience this game for as long as possible.