Whenever the demand is greater than the capacity, some transactions will inevitably be delayed.
No, if the price can adjust then demand will always equal supply. What kind of professor are you?
The price for fees can change, more wallets need to implement this feature tho. That is all that is needed for there to be no queues.
No, that doesn't make any sense. If 200 people want to take the bus but it only has 100 eats then it doesn't matter what the ticket price is - there will be 100 people that will be delayed getting to their destination. The only option you are talking about is that 100 people who really want to take the bus now are forced to take a taxi - aka, use something other than Bitcoin. While this is possible, it is also bad for growth when done by artificially taking seats out of the bus for the purpose of forcing ticket prices higher.
TLDR; Limiting the block size for any reason other than technical scalability reasons is a bad idea.