Passport renewal

My US passport expires in mid-2017, so I'm renewing it now. I expect the passport office to be swamped soon, if it isn't already. The regular processing fee is $110. You have to send your current passport with the application.

Things I would not have thought about two weeks ago while renewing my passport:

• The regular processing time is currently 4-5 weeks. Should I spend an additional $60 to expedite it to make absolutely sure it comes back to me before the inauguration on Jan 20?
  
• No, I don't need my passport right now, I'll leave the expedited processing for people who need it.
  
• I wonder if I'll get my passport back, and how long it will take.
  
• I wonder if I will really regret this decision.

I am deeply afraid.