"a lot" isn't really true. Of course , there is Always some people absolutely convinced that their character is in.
But if you ask the Geno thread for his chances , you'll actually get quite a lot of differents opinions. Of course , the Geno supporters want Geno , but some of the biggest Geno fans like Luigi The President are more realistic about Geno's situation. Some keep their expection really low , some debate heavily , some hope that at least the Geno costume will be back.
I'm not trying to give you a lesson , but please don't spread the "A lot of Geno fans are convinced he's in" misinfo if you see some very vocals supporters saying they are convinced about that.
And personnaly , part of me just want him despise his problems. During the grinch leak , I tried looking objectively at it , and thought that counter-arguments were weaker than pros for the grinch , since it was more like "How could Sakurai reveal 7 characters at once ? It could be an elaborated Fake leak." and it was one. But damn it was well done. Before the direct , I got hyped , and ended up disapointed , since there was nothing beside the Chibi-robo Mii costume that made me happy. I was a bit sad , but 2 days after , I just dealt with it and I was on the Geno thread again.
I didn't insulted people who were saying "LOL HE'S A SPIRIT LMAOOOOOOOOO" or insulted Sakurai's work. I was just a bit disapointed with how they ended thy hype cycle.
So even then , don't be scared to see Geno supporters actively trying to insult you because you supported DQ , and that it got in instead of Geno.
Because It's worthless , and won't change anything about the situation.