Not if your real objective was to eliminate a competitor
You eliminate a competitor that is weak and has overlap with your business, you absorb a competitor that is strong, has little overlap and can be additive to your business. AT does a lot of flying that SW wants to continue and the combined network has a lot of connectivity opportunities for new city-pairs. They're not going to get rid of 80+ airplanes that can't be quickly replaced when they need all the deliveries they can get to replace their 300's. Start listening to what the SW CEO is saying in public to the media, industry analysts, shareholders and employees.
Anything can happen in this business we all know that but you have to look at the information that is available to determine what is probable and what makes sense. The 717's will be operated through their lease terms until they can be replaced by the newest, most fuel efficient, re-engined 737's and Boeing will give SW excellent lease terms on the planes if SW agrees to replace them with the latest 737 version when it comes out. The 717's are just part of the SW/Boeing mating ritual.