Your quote actually states he expresses a desire that all new comers get a video. It doesn't say "no more videos = no more newcomers". There is a budget and the budget allocated for videos may have stipulated they were also to be for promotions and since secret unlocks tend to not be part of the promotional material they don't get a video. We already saw in Brawl that Jiggly, Toon Link and Wolf who were not part of SSE didn't get proper videos when you encounter them.He said so himself. No more videos = no more newcomers. Or are people going to start saying Sakurai also doesn't know what characters are in his game now?
Also "nearing the bottom" is a vague measurement. It could mean we're over half way through the newcomers. So with nine announced having eight left or just one left would both be equally nearing the end.
Too many unknowns to say something is fact.