The 18 volt mod does in fact open up the pickups dynamic range but nowhere near the dynamics of passives, even my boutique passives. there is still plenty of compression happening with the EMGS.
the difference is marked though, most notably when playing clean. The EMGS even at 18 volts still have a sterility about them.
EMGS wont become obsolete. as you see they are adeptly responding to the changing market with newer models to address user complaints. Many still find the EMG the ultimate metal pickup and would never consider a passive.