The apprentice, I'm sure you have been on the forum long enough to know that thread titles should be relevant and contain some or all of the words you are querying. "What's wrong?" is no help. Your thread could have been called "As hundreds streamed in" or something similar.
It's not the neatest sentence and I would certainly say "doorways" instead of "doors" but I don't have a problem with "as" at the beginning. It's not really necessary and I would probably omit it, adding "with" before the first "more".