Somebody told me they were going with the 3.0.
I would say yes, at least until 2 strokes become out of fashion.
Merc is no longer able to sell the 2.5 race motors anymore with out them being emissions compliant. Apparently the EPA determined that if the unit can be shifted, then it's not a race motor. If merc continues to sell power heads and lower units separatly as a "replacement part" then the 2.5 could live on for some time. The question is if merc will do that or if all 2.5 parts will cease to exist in 8 years.