A change to 65 will impact SWA pilots far less than the legacy pilot forces for the next few years.
No equipment changes, so no affect on big jet access.
SWA's pilots nearing retirement are relatively few since SWA was so small for so long.
Fewer SWA pilots will work to the full 65. They'll have adequate retirement funding, unlike so many who lost their DBs.
SWA's growth (10.8 pilots/ac) will continue to account for the lion's share of upgrades/hires the forseeable future. That's about 400 hires per year. It'll all reach a point of equilibrium in a few years anyway.