If the crew can't complete there duties then you would miss you slot. In slot airports in sapin Ryanair have to call for there slot before the actual departure time and if they don't call for it they will lose it. You flight would be delayed even more if you were all taken off and you would be giving out about that as well.
No overhead bins hold everybodys cabin baggage when its a full flight. What is the problem with it under you seat?? You could of asked to have it placed in the hold area.
No other airlines have long queues at check-in. I suppose it ryanairs fault that there was long queues at security??