Will Dimmu Dorgir be able to make good composition without Vortex and mustis ??

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Well During In sorte diablo Ics vortex(bassist and clean vocalist) and mustis(keyboardist) Left the band. I think that they are very good at their work and dimmu borgir will not be great as before...I mean may be shagrath can do all work but Where do the get Vortex voice. What will they Do live ??? Give your suggestions. What is the future of this band.. Is this possible shagrath remain alone and it will become like burzum or xasther give your comments for both...