I think a big part of it is the empowerment from the subject being taken seriously. People are now willing to go into more detail and bring forward additional claims. SOL did a great job of uniting scientists, experts, and people with first hand knowledge. All those who attended or followed the event helped emboldened by each other. Even those who have spoken on the subject before are now more comfortable in opening up further. Their tones will vary from relief of opening up further to frustration that they've had stories that could never be taken seriously.
The urgency is harder to explain. With politicians and government officials it makes sense to get ahead of whistleblowers and any uncontrolled disclosure. However, I can't say the same for UAP experts and talking heads. It could just be that empowerment breaking the flood gates and their eagerness to open up more coming across as urgent. Or they feel that larger news will break that will be harder to grasp without the public getting caught up to speed.
I don't personally back or get wrapped up in any specific theories on why, but it definitely stirs the imagination. In any case, I think that 2024 should have a lot in store for disclosure.