This is the best outcome possible. Obviously, there shouldn't have been a trial in the first place, but given that there was, the end result couldn't have been better. If the judge would have dismissed with prejudice, that would have caused all sorts of uproar and accusations of rigging. Without prejudice, and there's a chance he gets convicted after another trial. The prosecution wouldn't make the same mistakes again. If they had gone back and returned a not guilty verdict in three hours, there would have been definite criticisms about a biased jury. The days of deliberation gives the decision a kind of resonance and finality. They obviously debated this a lot, and at least one juror was reluctant to acquit at first.
All that being said... This is not over. There will be a concerted effort to ruin Kyle Rittenhouse's life. It's inevitable. He got away, but the left have so many other ways to get him. They're also going to go after the judge; I've already seen media apparatchiks call him a white supremacist. They may also go after the jury, as MSNBC clearly tried to do already.
And there's going to be crackdowns. Crackdowns on alt-media. Crackdowns on videos like this on social media platforms, crackdowns on the kind of commentary like Rekeita and Crowder were doing. The left plays long, and has a way of turning temporary defeats into long term victories. Yes, it's a great thing that he got acquitted, and tons of fun to see the blue checks seethe. But this will continue, in some form or another. Stay vigilant.