I like triggered drum sounds, but sometimes they really quite suck. I don't think triggered drums would necessarily fit with Opeth's music as well as micing up an acoustic kit. I record with electronic drums for simplicity, but if i had the space, money and time i would rather use miced up acoustics.
I definitely agree with everyone when they say Tomas Haake would be the better match. But quite frankly, i think Opeth are happy - they're found someone they clicked with and who can do the drumming they want..For them i bet it's a question of 'What more do we need?'.