You are no longer unkillable. You will have to balance damage with your tankyness to win exchanges. BUT you will also be harder to kill compared to the other players building the shiny new damage items meaning that YOUR team will do more damage also. So your role as meatstic cc pealing beast will be even more important in the new environment but will require much much more coordination and teamwork because you will die quicker than before.
"A cornered fox is more dangerous than a jackal!" -Grayfox XBL/PSN : GrayFox312k