The reason why Castlevania (Contra, Megaman, etc) is good is because the creator developed a gameplay mechanism first.
The idea of a character who could whip things works in 2D. In 3D it becomes very complicated.
Sometime the transition works. Mario, Zelda, Final Fantasy, etc.
There are two reasons why it worked for them.
1. They put care and money into the series, while the others are being milked.
2. They gained something from the transition.
The games back then were fun for a different reason, we liked ridiculous challenge and memorizing levels.
Gaming is more mainstream now, and the old schoolers don't have the time to commit to challenges like that; add onto that - that type of gaming doesn't really work in 3D.
Zelda, Mario, and Final Fantasy were have elements experimenting and exploration that hold the feeling of the series while transitioning.
For CV in particular 3D games have been tried several times, even when they put money and effort into it, it didn't work. It's just was not fun. Sorry.
If they gave it another shot, I would need a lot of convincing to buy it.
I would cite regulation, but I know you will simply ignore it.
