W-r-o-n-g.
Sakurai doesn't think a Playable Ridley would ruin his "art" of Smash.
We have two interviews to prove this.
After Brawl, his response to Ridley as a fighter was: "It may be impossible, but if we managed it he'd probably be a bit slow. Would that be okay?" before letting out a bit of a laugh.
To elaborate his reasoning in line with that, after this game, he said, in his own words, that Ridley is a menace and a boss in Metroid. He, in the amount that he either worked on or at least ran through the idea through his mind with various levels of mental implimentaion, that Ridley's intimidation would be ruined if crammed into the confines of a fighter.
Ridley isn't playable because Sakurai believes it'd ruin RIDLEY, not Smash.
Inklings have already been playable. So THAT is moot. Edit: Their identity are in their playable status in turf wars and combat in Octo Valley spraying ink and controlling territory with it using a wide variety of weapons. The
only part of this that may get "stifled" is in the ink terrain control, if the 3DS strains with it.
,
, and
alone show the ease of having a character switch between weapons across their moveset.