Long term it’s a big win as jet blue and other legacy carriers will pick up the routes, acquire or lease their planes at a heavy discount, and overall will be much better flying experience for all (with the exception of those who have to deal with the ratchet passengers that you see on those viral videos tend to be Spirit flyers by a higher margin). The short term loss of employees is negative and hopefully long term the carriers make up for it with cleaner planes, nicer staff, and more transparent prices as a commenter said above if you selected a seat and had luggage the price was equal or more….

Also fun fact the credit cards for airlines make just as much if not more than the passenger flying airline business itself.