So many great points have been made here. Simply put Southwest really needs the Max-7. The smaller more fuel-efficient plane fits our business model and many of the niche markets we serve.
I totally get the cries of do not put all of your eggs in one basket but like others have said you can't just flip a switch and get 200 A-220s or E-195 E2s here in the next 6 months. I sure hope Boeing can get their act together but hopefully in 1-2 years we will start getting dozens of Max-7s and hopefully they serve us well.