Senku doesn't really see himself as an optimist, though he is one. He just seems himself as someone who wants to see the future, who wants to know everything there is to know about the world. He's not a pragmatist, though he might think of himself as one.

He also doesn't really deal with the horror of what he's been through, thousands of years of isolation, nearly dying a couple times. Whatever! It's fine! Probably!

He considers her question.

"Most of them aren't conscious. I think the ones who maintained it are revived now, but ultimately there aren't too many we've managed to wake up. I perfected the formula to revive people, but we still need materials to mass produce it, and we need to rebuild some infrastructure to support the amount of people so it's not just all chaos and fighting."

That laugh again.

"I really didn't think you'd believe me. But either way. We also have to make sure we don't get petrified again. We know what caused it, but not the source, who created it or how or why. That's the next thing to solve."

He goes back to his can opener for a minute.

"So why are you here instead of one of those houses? Seems like those would be more comfortable."

He's not terribly bothered either way, having lived in the literal wilderness for months at a time. But he's curious.