For me, getting two versions of what's essentially the same game has always been a no-no. It's true for Pokémon, it sure as all hell is true for Sonic, and it's true for Smash as well. So from that point of view, in order to have one extra character in my game, I'd have to shell out $45. NO THANKS. Not even Mewtwo is gonna sell me on this. I have so many better things to do with $45. Food, the rent, electricity, cable bills, saving up for my old days... screw you Gandalf, I'll pass.
As for the Ridley thing... well, it's a nice way to have him play a role in the game despite not being playable. Too bad most people will see what is actually a gift as a kick in the nuts. By the way, if you KO him, he has his own image in the results screen. Imagine if THAT leaked before the game came out, convincing everyone Ridley would be playable, and this is what we'd get. Holy shit, Sakurai wouldn't only get death threats, at least one crazy would actually kill him.
Regardless, they knew all along about how much people wanted Ridley in, and while this is a nice workaround to the size issue (along with everything else), this basically means that his odds of making it into a future Smash game are about the same as those of President Gerald Ford.
Scratch that, you can make a Gerald Ford Mii if you really want to. So make that LESS likely.