First of all, console upgrade and new version is a must on electronic Industries . To generate less onmanufacturing cost and increasing some profit , Nintendo like it or not, they will soon revising their internal chip.
Second , Nintendo need to keep a life cycle product, to keep the sales up, by renewing their product they will have a steady sales, so instead of releasing new consoles every year, they will instead renewing and make small modification , by re-branding and made some small improvement without loosing a big cost.
Like it or not, if the new tech is coming , the old spare parts will not be produce anymore and it will be more expensive, then the new chips, so they will replace the old one with something better , cheaper, and smaller.
In terms of tech perspective and Marketing perspective, hardware revision is a must or i could say a normal thing in Videogame Industries.