I think so, but I think a lot of people will be thinking it just lets you use the amiibo, so it won't be a huge deal to them. I'm excited myself, but I can't update yet for certain reasons.
I think it will. This game was updated significantly for the first time after 4 years, so that's a huge deal and I think most people would come back after hearing this. Then again, they might not be all that interested since this requires amiibo, which is purchaseable seperately.
I personally bought some amiibo's myself, but I really have come back to this game and now finally started constructing my town much more seriously, finally buildiing the dream town that I've been wanting to have in this game.
I mean, it got me to sign up for TBT, so I'm sure there will be lots of people who at least register. There will definitely be an uptick in people trading for all the new stuff and people wanting to ask questions about the update.