Keyword: “prediction”
But yeah, at least the leak got people to finally entertain the idea of Simon Belmont in Smash.
I know that most of them are putting them only due to the leaks. but as you said, people are opening to the idea, people that arent us hardcore fans. and as you posted before, even if it was wrong, chorus kid support is mostly due to that leak. (wouldnt mind a rythm heaven rep, in fact i love the idea, but chorus kid don't convince me too much)
Regarding the "why now?" if simon always have been in the back of sakurais head (akin to cloud) maybe he entertained the idea of putting him on smash 4, but the whole development of smash 4 was under the konami meltdown saga (it was a lenghtier process than most people realize) and now, even if konami havent been back to their nes to ps2 selves, at least the situation have been normalized a bit.
Heck, they even managed to develop a fully functional game (and no, im not talking about metal gear survive DX). If simon belmont is in, i also assume we likely would see snake return, even if is as a DLC.
looking at konami right now is still a hearthache though :/ while Super mario bros, mario 3 and megaman 2 were 3 games i played a lot on NES, easily the biggest ammount of time spent on NES was konami games, Castlevania, Contra, Gradius, Rygar, Rush and attack, heck, even hi no tori! (firebird)... and easily my favourite psx and ps2 games have to be konami :/ ...(I still to this day think rush'n attack was bull**** though DX)