Could Nexus turrets respawn after 10-20 minutes on Summoner's Rift (or others)?

I just feel like if you can hold out while down 1-2 nexus turrets, that they should respawn SOMETIME soon instead of staying dead forever. I've personally had quite a few games that we lost nexus turrets early by around 25 minutes and were able to defend until almost 60 minutes. Why is it fair that we were able to fend them off for over half an hour, but then don't get a chance to do anything unless we ace them because they can backdoor at any moment in time. It would just be nice to be rewarded for managing to hold out a bare-nexus defense for a long time instead of praying the enemy team fucks up and lets you ace them while your minions manage to push past the enemies super minions far enough for you to be able teleport and win.