Well what SE could do is the change the BLM proc spells using tier 2-4 elemental magic and tier 1-2 ga spells, and also make Scholar Helix applicable as a proc, this way you will see BLM, SCH and RDM along with Nin, War, Mnk, Thf, Whm as part of the aby party set up. Heck in that sense, Smn/Blm could also proc albeit missing a few ga spells and tier 3. Also if you pay attention, you could go where you avoid near lightsday/darksday if you don't want to bring whm to proc light. Then again you would miss out Cure 5-6. Now if SE add Cure 5 to Sch and Rdm, then those jobs would get some love back.
The current best set up of jobs work for now because they give you the most bang for your bucks. Of course the downside to this means that half of the other jobs are not seen as useful - for low group farming - but usually fine when you go with 8 people set up. You can always level those jobs - with abyssea - it is very fast to get to lvl 90.