Exyusubs.com · Limited
ExYuSubs.com is a community-driven platform for high-quality movies and TV shows focusing on the former Yugoslavia region, where user registration is currently closed. Registered members can resolve login issues via the on-site contact form, while urgent support is available through their Discord community. Read more at ExYuSubs.com. ExYu Subs - Movies and TV Shows in HQ
The door was never really closed honestly. In the situation Nintendo DO want to simply update the existing Wii U/3DS version they don’t have to contract Sakurai, Namco or anybody else to do so. They can do it themselves. Of course keeping the characters in the game depends on licenses.
This is ONLY in the case they want an updated port. They could do a new Smash Bros but either way a 6th instalment will hit Switch eventually.
It just depends how Nintendo want to do it.