Many people rush to invest in Bitcoin immediately they have the information of Bitcoin having coming to manifest but they don't know that If halving May fail and also may not fail
AFAIK, there's no history of halving that it had failed. What do you mean about that? I don't think a lot of people thinking about its failure because it's just the block that will pass by and then the mechanism of the Bitcoin blockchain will automatically cut the rewards into half by reaching 210k blocks are mined as programmed.
I think the failure that you're saying is about the effect of it. Maybe that's the concern of the many people that you've seen worried about it.