I wonder if kids feel the same way about Mario that they do about Legos, and that's why he does talk more now than in the past. There was some kinda focus test for the Lego games and kids were wondering why the Lego people didn't talk, because in their imaginations they did talk. That's why Lego people talk now in the games.
So I wonder if something similar happened there.
Wait what? No
Its totally differnent. They decided to give him a voice because he is just like a classic cartoon character and cartoon characters need funny voices.
His not a mime, he needed a voice, full stop.
He doesnt even have real dialogs in the games.
Kids also always heard Mario with a full voice since the beggining, form the cartoon and mario bros super show, they new Mario didnt had a voice in the games because of limitations. When they decided to give him the Mickey Mouse treatment in Mario 64 (or in the mario typing game) and put Charles Martinet behind the voice, the majority of people and kids saw it normal.
Theres no talking more than in the past from Mario (im talking about the games here), is practically the same from all the Mario games since Mario 64.
And lego games are a totally different thing, apart from being actual dialogs in the new ones and not voices, something the other lego games already had, if they had decided from the start to give lego dialog no one would give a fuck, but Im sure it was starting to get a little difficult writing original stories with the lack of dialog, in the last games they were overusing the same mute jokes again and again, and apart from the focus group, it was starting to get stale.