As we are nearing Heavensward end, it'd be nice to add another incentive to que pvp in long months before Stormblood. Rank 60 will match lv60 cap of HW and will allow more builds variety with an option to upgrade up to 15 pvp skills, including those which are usually ignored like 'Increased main stat', which also should be buffed to accomodate new level cap.
The controversial ranked Feast minions can be tied to a new 'reach rank 60 within all Grand Companies' achievement, which will keep Frontlines alive for a long time. No doubt it'll be grindy, but as they will not be time locked anymore and can be obtained anytime with enough efforts there shouldn't be as much complaints.