Is it really about death timers?
Or is it about turrets? 40 seconds should be enough time to maybe take a turret / inhib and get baron to finish out the game. But when turrets are so fragile you can just push and end it off of a single lost team fight seems like its more the turrets and not the death timers. Would make more sense (to me) to give turrets a bit more defense so your entire base isn't destroyed in 40 seconds.