3DS has been on life support for at least 2 years now. Nintendo kept reiterating that they will support the 3DS all the way through 2019 but there is hardly any evidence to support that. In the last year, what have we gotten... Detective Pikachu and 3 ports? The 3DS doesn't even get a mention during Directs anymore. The system is dead. I'd say the last major release was Pokemon Sun & Moon at the end of 2016. Even when Ultra Sun & Ultra Moon came out it felt so unenthusiastic and lackluster. Don't get me wrong, I love the 3DS, it's probably my favorite handheld of all time (unless you count the Switch) but anyone who thinks the 3DS has been actively supported for the last year or two is just lying to themselves. It was on its way out ever since Switch came out. I'm just surprised it took Nintendo this long to kill the system for good. So to answer the question... the 3DS will probably officially be out of production this year. There's just no reason to continue pretending to support it. It had a great run, it lived a good life, now let's move on.