I was just googling stuff and came across something on Gamefaqs, which led me to
this thread. The one person who replied said that once the Wi-Fi shutdown happens next month, they said that not only will you not be able to get new visitors to Join Avenue, but you also won't be able to do Funfest Missions OR the Yancy/Curtis sidequest.
In my Wedlocke challenge that i'm doing on my secondary White 2, which is on my capture modded 3DS that hasn't connected to Wi-Fi once since I started playing it, i've had new visitors in Join Avenue on a decent basis (even though I only have a few shops). Is the Wi-Fi needed for anything for these three tasks that I mentioned? Will the shutdown affect any of them?