I am going to admit a truth that I don't normally admit to. I loved the assemblies. But my experience wasn't the same as you describe. I loved the energy during intermissions. Even walking around during the talks held a level of awesome energy. The attitudes of people was so different to what they were during regular meetings.
I couldn't stay awake during Tuesday night bible studies or Thursday night one-hour meetings let alone during 2-hour Sunday meetings. I always knew I was going to sleep through most of the assemblies as well (that's the truth I don't normally admit). No one ever addressed my problem with this. I didn't snore. That probably helped. I tried to take notes, but invariably, I just accepted defeat and went to sleep. Looking back, I realize that it was really good sleep. I enjoyed it. I could do that again.
That isn't what you meant when you asked if we could survive, I know...
I could survive the experience in that regard. But I have learned that I can't be casual about attending something so dangerous. The muscle memory and nostalgia would make me welcome it. It was my normal, my default setting and that always feels so good. But that is a dangerous place to put myself. It would be mental warfare so subtle they wouldn't even know they were doing it to me. I wouldn't know it either, not until I caught myself singing an old bible song (I don't want to listen to the new trendy songs!! ew!) or thinking in JWisms. In that regard, no I could not survive it again and it wouldn't be worth it to attend just to see what it's like.