Regardless of their new seating scheme, it still is a hassle not to have assigned seats. SWA is still creating a cattle call mentality with their new numbering procedures. When passengers board planes, they still fool around deciding where to sit. Give them a seat number and be done with it.
I happily pay a little more to fly on airlines with assigned seats, and in many cases those flights don't even cost me more money. Would I pay more for a preferred seat on SWA (aisle, bulkhead, etc.) Absolutely not! It's not just the lack of seat assignments that annoys me.