There were other Buddhas ready to step in if needed. The thing about Gautama was, he was the first person from our own human race to reach such a lofty rank. This is what makes Gautama and his efforts so special.
Hi Nick... Well, as with many posts here at IO, it can be taken a number of ways. I just react from my own perspective, which is partly timely and partly fresh out of time.
I'm sure Gautama must have been inspired to look back and see all those other Buddhas lined up behind him, wraithing patiently just in case he failed to perform. Then again, it could have been more like a reluctant hero facing a dragon looking back only to find his comrades had taken the last train for the coast.
Seen another way, putting oneself in Gautama's shoes, one could scarcely imagine what kind of pressure he must have been under, being the first and all. The fear, the trembling, the uncertainty. The realization of his own weakness and human ruin. The failures that always come back to haunt us. And yet, the hope against hope of something better, something henceforth unknown.
I have something akin to empathy for that position, an unknown position, never seen before. The love driving him forward with all his inadequacies... To what? It must have taken considerable faith and lots of love. To know you are totally unworthy and yet to move forward toward the unknown. Only people in love with something can do that.