To clarify what I was trying to say:
You can't keep going up and up and up infinitely. In story telling, this quickly leads to viewer (and writer) burn-out*; in a product like Smash Bros., not every character is going to elicit the same response to a character, like Shroob said, he had a non-reaction to Simon, whereas a Castlevania fan would have had the exact opposite reaction.
For fans of Pikmin, Olimar being Brawl's final pre-release reveal would bring tons of hype, but for non-Pikmin fans (like myself, especially at the time), all you'll get is a "Huh?" response. The same applies to Duck Hunt (Duo) for Smash 4, people unaware of what Duck Hunt was (say, kids of today), would have been totally nonplussed by the reveal.
The same will apply if Geno is the last character revealed, casual fans who aren't aware of who Geno is (say, most of Europe) will be left confused, maybe the trailer will sell them on the playstyle, but they won't necessarily be hyped for him specifically as a character, because they don't know who he is.
*some would say escalation is a huge problem with franchises like Dragon Ball, DC and Marvel Comics; you can't keep saying "THIS GUY IS THE STRONGEST EVER" and expect it to mean anything after, like, the 5th time it happens. Reducing the stakes occassionally is healthy for a production.
Anyway, I have no hard feelings regarding this argument; if I sound terse, it's because I'm pretty tired.