I have my manhig, you have your manhig, and yennem has his manhig. With the utmost respect, R. Elyashiv was not really your manhig, though he may have been your manhig’s manhig (or perhaps the connection was even more attenuated). I imagine your own Rav will decide who to refer major questions to now, assuming he ever referred his questions to R. Elyashiv. In any case, I don’t think R. Elyashiv was being manhig anyone for the last year or so, and that those who previously relied on his age direction already chose new poskim, and teachers to fill the void.
Yehi Zichro Baruch. But let us not despair. We have lost leaders before, and new ones are chosen to take their place – often, the new ones already are in place.