Nah.
Sure I think Link is a swell guy, but far from the brightest star in my sky. Samus as well is dead to me as a character. Yet, I have been using them in SSB64 and SSBM respectively for over a decade now. Inversely, Marth is my baby and I love the Mother series, but aside from Ness in the early days of SSB64, neither the Fire Emblem or Mother series has offered worthwhile play experiences in Smash Bros. If I want to enjoy those characters, I'll play their respective games. All I care about when it comes to playable characters is function. For all I could care, this could be Dragon King: The Fighting Game. As long as everyone functions as they do, I'd be playing it.
Within a month the majority of the people still playing, especially those who are very enthusiastic about it and play regularly, will gravitate to the character they enjoy most, whether it's because play style or they think the character is the strongest and want to win. I have a hard time believing the majority of people who have not seen the full roster, and have not even played the demo, will know who they will really be maining a year from now if they play the game often enough. At least I can say the Villager was a lot of fun and suits how I want to play the game, where as I really doubt they will ever allow Samus to play as she did in Melee again.
That said, the fact it contains the characters I have cherished for over 20 years is always nice. I love the stages, the music, the trophies and other fan service. Elincia is my favourite Fire Emblem character, and to me having her as a trophy means just as much having her as a playable character. For me, it's not the characters I like I want to see, so much as I want characters that reflect Nintendo's rich history and product diversity. The games have such a broad and rich legacy, and consequently I am not too keen on new characters becoming new fighters.
Edit - I also want to add that for a lot of people, they love a character only after they have grown to love them in Smash Bros. Marth and Roy in a way are the saviours of the Fire Emblem franchise. While not the same, in my case, I only liked Rosalina after Mario Kart.