1. Came is wrong. Absolutely wrong. When expressing wishes, we always use the infinitive form with "would." "I wish he would leave, not I wish he would leaves." "The bus came" is past tense, but you are wishing about something happening in the future.
2. This works for me either way. It's about the future, not the past.
3. I would use "was" here.
Student or Learner