Do you really believe that 5 minutes of interacting with his mom is better than living an entire life with his dad?
That's nonsense---
However, it's clear that their is more to this than what was shown.
Obito!! When minato fought obito he realized that KONOHA would need power in the future- a jink-
The problem with kushina sealing the kyubi in herself is that it would reform and obito would have a chance of getting its power-- that is the real reason as to why minato sacrificed himself- in order to provide the hidden leaf village with a jink-- without a jink he feared that the balance of power would be broken.
Basically, minato could have survived, however if he did KONOHA would loose the kyubi. He sacrificed his life in order to provide a powerful ninja for KONOHA .
Kushina sealing Kyubi back in herself and DYING is a result as an even bigger plot no jutsu than Minato dying. We saw that re-sealing a beast into a jinchuuriki renders the extraction irrelevant, after all, is that how Naruto was saved after Kurama was extracted from him?
Now here we have Kushina saying 'I'll re-seal the kyubi into my self and take it to the grave', WTF!!!!!
She had even more resilience than Naruto (she was awake and even subdued Kyubi after extraction whereas Naruto lost conciousness) but she will die after re-sealing Kyubi into herself? But at the same time, that same situation with Naruto, everyone, including with Minato seem to be sure that sealing Kurama back into Naruto will revive him? Really, Kishi must think we are idiots. I'm actually offended