Ah, gotcha... I am familiar with that quote but I wasn't sure if anything else was said that I missed. That's why I'm often upset when people deal with absolutes when it comes to quotes- there is usually room for interpretation.
The entire quote is:
"It isn't a matter of 'if the next game has 50 characters, that'll be enough.' There is a certain charm to games that have huge casts of playable characters, but they tend to have issues with game balance and it becomes very difficult to fine-tune each character and have them all feel distinctive. In terms of quantity, we've probably already reached the limit of what's feasible. I think a change of direction may be what's needed."
If we were to read that literally we would probably have to see a few cuts just to deal with the amount of new comers we've already seen. What I mostly took away from this is that the next game would require more than just a massive roster to be successful. It should also be noted that this was made in July of 2012, when production of the game had just begun. Since then, all we've heard is how smooth production has been going (especially compared to Brawl.) His not wanting to make cuts comment was actually made a full year later, and a lot can happen in that time. It is entirely possible (and complete conjecture on my part) that he could have planned out a decent batch of new comers with a healthy amount of cuts, but decided to reinstate characters due to how well development was going. It is also possible that we've seen all but two new comers. Like I said, it's all speculation at this point.
As for Ivysaur and Squirtle? I think it's odd we didn't see them at the same time we saw Charizard, and since I believe Jiggly Puff and Mewtwo will likely be back it would make for a roster with 8 playable Pokémon. Now, I don't believe that Pokémon can't have more spots than Mario or anything like that, but it does seem a bit extreme (to me anyway.)
You are right though, there is nothing explicitly pointing to their exclusion. It's the same with Lucas and Wolf (whom I think are probably in), really... people believe there will be cuts and are just trying to justify possible candidates for those cuts.