Who do you think should take over Dan´s duty and also be the new vocalist?

I think as of right now, NMF lineup is possible. This is what I hope for every day and what I told Anders and Jonas!!
 
P-E-T-E-R T-Ä-G-T-G-R-E-N!!!!!!!!!!

He still wants to do it again, I talked to him yesterday, but that's if you don't plan on touring. Which in my opinion as I've said before, it would be best to stick to the studio to have the most elite of all musicians, which includes Dan and Peter of course. There are just no two people that can match or exceed the talent of either of these guys.
 
Muhammad does not even remotely fit Bloodbath as a vocalist or a guitarist.

Roger Johansson is the best choice I can honestly think of.