If you lost a single inib you should still have 2 turrets protecting your Nexus. If you lost those turrets, then you are in a risky situation and should play accordingly.
If you only have 1 turret, a few champions in theory can take it out, but your team should still be able to defend.
also you dont need teleport. shaco, yi, jax, etc can just casually walk into the base and take it.
Wait, is that a troll or just misunderstanding? If THE DEFENDING TEAM has no TP to quickly answer to a backdoor they must be careful, not the ATTACKING TEAM using TP to backdoor.
Anyway, there are at least 5 turrets an an inib in the way of a pushing team. If you failed to defend those, you're probably going to lose even if given one extra defensive line.
it also would not increase game length.
Of course adding one extra line of defense to a base would increase game time. Ok, this is trolling and I'm feeding it.
You got me, GG WP.