Alright. I can sense the types of comments this thread is about to be bombarded with so let me explain.

Persona 5 on the Switch seems possible, but is literally impossible considering Atlus Japan's stance on their IPs going multiplatform. Since the original Revelations Persona on the PS1, the series has always stayed PlayStation exclusive, at least the main series. The primary reason being that Atlus believes that if they relegate their best selling IP to a single platform, then those that discovered said IP would buy future PlayStation systems to continue the main series and support them as a company. It's also why Catherine is now a PlayStation exclusive alongside Persona, or why Etrian Odyssey and Shin Megami Tensei are Nintendo exclusive.

Another reason is that Atlus typically tend to release their best selling franchise installments on whatever system has the best install base at the time, garnering more attention. Its why Persona started on PlayStation in the 5th gen; its why Nocturne is the sole game in the franchise on PS2, and also why Persona 3 and 4 were on there.

Now I know what you might be thinking, "But the Switch is now the fastest selling console worldwide and one of the best selling consoles of all time! Why isn't Persona 5 on Switch?". Firstly, Persona 5 released while the Switch was still in development, and it made sense from a business perspective to put the game on the best selling console at the time, the PS4, as was also series tradition to retain the loyal fanbase of PlayStation owners and entice them into buying PS4s to experience the next installment in a series they heavily supported. See, now both of the mindsets Atlus carries as a company apply to this one game and the platform choice of the PS4. The reason why Royal, then is also a PS4 exclusive is because Persona 5 on PS4 already proved to be a massive success for the company, becoming the fastest and best selling title in series history, so obviously, they'd want to retain all the people who gave them and their game attention, despite the Switch having overtaken the PS4's lifetime Japanese sales. Then again, Royal was probably in development for a while before then.

The reason they put spinoffs like the Q games and most recently, P5 Scramble on platforms outside PlayStation, is quite frankly because the company sees it as a low risk effort to try and entice people into picking up the console the main series is relegated to and give the main game more attention. It's probably also why Persona content in Smash is one of many different crossovers Persona 5 has in particular with other companies, just to boost awareness for the main game and get people to pick up PS4s. It was likewise, a smart move to reveal Joker's inclusion at the Game Awards, and appeal to that audience that has a sense of familiarity to the character because Persona 5 was nominated for best game OST and GOTY, but ended up winning Best RPG overall.

Atlus doesnt work like other gaming companies. They dont see other platforms as an opportunity to find new audiences, but instead to bring them in and merge them with audiences they've held close to them for years. Until and unless they change the way they look at how multiplatform titles are beneficial for their growth as a company, they won't even consider putting a game as big as Persona 5 on other platforms outside PlayStation, and the same applies to SMT on Nintendo systems.

And that mindset has worked extrordinarily in their favor to this day. Because of that Persona 5 is frankly never coming to Switch because Atlus doesn't want it to.