I've seen this misunderstanding a lot over the game, but Dracula does not break the Mirror of Fate at the end, what he breaks is the Wolf Crest, which shows he chooses staying there with Alucard over staying in his own world in the Castle with those visions (ghosts?) of Marie and Trevor. You can see the crest glow with the same blue glow that it does every time he gets it out and holds it up.
Then you can just chalk up him saying "Who knows what fate has in store for us" to bad writing and a plot hole.
Really?,
I think is the mirror, he looks at the mirror to see his future, he likes it, smile, and breaks the mirror, he don't need it anymore because he will find peace soon.
My opinion about the game.
In my opinion is a great game, first of all, reviews below 7 are total BS, never had any problem with the stealth parts, a non issue for me and to be honest I have fun with them but I must say that they don't belong to a Castlevania game.
I feel like they dropped the ball with the last 3rd of the game, the story feels rushed, characters underused, the last boss is mediocre, and the ending was OK but not the ending to close the LoS saga, they better have a kickass last boss and ending in the DLC.
The combat is super fun but the mastery system is pointless. Music is amazing, the art in the castle is amazing as well but the city is mediocre at best. Love the Carmilla and Toymaker parts but I'm dissapointed at Alucard's role in the game and the absence of Simon, the story had a lot of potential but they barely scratched the surface, overall I love Gabriel in this game, probably in my top 3 of favourite Castlevania characters.
Overall, taking into account that Castlevania was a dead corpse before, MS not the most prestigious company with lack of resources, I think they have done a great job, no matter what happen with this game, the franchise is alive thanks to them and for that I'm grateful, plus LoS1 is one of my favourite games of last gen.
Now is up to Konami to chose the right developer to continue the franchise but they must know that some fans can't stand change, they live in the past and they can't accept anything but SoTN clones, good luck with that.