Once Geno gets in, it's going to shatter time and everyone's going to merge with their childhood selves, and see things as a child does again. The infinite blue sky, the sunsets laced with nothing but pure excitement for tomorrow, the overwhelming rush of experiencing new emotions for the first time.
I mean, that all sounds cheesy and overly dramatic, but there's something missing, and to have that piece returned is no small matter. Geno is 'just a game character', but he's an important part of the very developmental periods of so many people. There's a reason people look back fondly at media they were exposed to as children, and there's more to it than simply being pleasant childhood memories. If I hadn't played SMRPG, then I wouldn't have had the thoughts that I did back then, and therefore wouldn't have had the chain reaction of all of the thoughts I've had since. I'd literally be a different person, because my mind and heart would've formed around something entirely different as a child, and I would've carried that with me as I grew up and moved into my adult life. For me, Geno really does represent a mindset and worldview that I've all but lost in the modern age. I still devote myself to many of the same things that I did as a child, but the feeling is different, these days. It might be a small piece in the bigger picture of my being, but it's a missing piece regardless.
The thought of being whole again is intoxicating.