That's pretty interesting, basically a chance they just shoved it as far into the future as possible then. Since likely even they didn't fully know when everything gets pulled.The way the post-eShop "free trial" of Bank works, it's for a large number of days where only the last two digits of the day count are displayed in the app. Plotting out all the possible numbers that could come before those digits, and the days they would lead to, one of the most plausible possibilities pointed to an expiration date of December 31, 2027. However, subject to fuzzy interpretations about whether it's counting down to the start of the day or the end, another consistent possibility is to have the countdown end on December 31, 2050, which is noteworthy because that's the latest date that can be set in the user-configurable time settings on the 3DS. (Switch is more forward-looking and allows you to set dates as far forward as 2060, but these are both regressions from the original DS which went all the way up to 2099.)
If it's counting down to the 2027 date, I could seriously believe them intending to keep the service running that long and no further. We would also find out whether this is the case or not as of April 6, 2025, because on that date, a countdown to the end of 2027 would tick over from "?00 days" to "999 days". Meanwhile, if it's counting down to 2050, I wouldn't expect them to keep the servers running that long, and instead it should be thought of as a placeholder date until the plug suddenly gets pulled. My best estimate about when they would be likely to do so was probably around 2027 anyway, but maybe move it up a year in light of this latest announcement.
That said I could see 2027 anyway. By that point we're probably in the midst of:
-switch 2 being out
-pokemon mansion being out
-switch 1 in the process of sunsetting its online services, which would include Home probably going into the similar "no longer have to pay (because you can't)" set
So at that point Bank is ancient, on a system seeing no support and long since gone fully to the aftermarket, and no longer being held on as an incentive for the premium plan (because it no longer exists). About a good a time as any to just finally pull that plug.
(And also hopefully the Home sunsetting is less....janky. More planned ahead of time.)
Though, I guess worth noting: we'll still be able to redownload previously purchased stuff from the eshop until further notice. The Wii to my knowledge can also still redownload stuff.
Maybe the reason Bank (& Transporter) are still hanging on is because they get to hang with those servers? That could be nice and go with the "2050" theory.