only prob with the level cap to 80 is that everything you fight now would have to be moved up 5 levels. Plus you're getting 5 real levels AND 3 subjobs levels if the cap moved to 80. That is a big difference. Just like when you're lvl 70 and you're trying to fight things that lvl 75 can barely hit as melee (kirin, wyrms, gods, hnms). SE would just raise the lvls of everything by 5 and then you'll be right back where you started saying i wanna be lvl 85 to make my job stronger so i can fight those strong mobs... then if they raise it again.. SE is gonna raise the difficulty of every mob again by 5... just a viscious cycle over and over. If they didn't change the diifficulty on mobs, you wouldn't have anywhere to merit. Already the C. Mire, B. Thickets Zones at 75 are only littered with VT mobs... 5 lvl increase in your job would make them either T or EM++. Beastmasters and Summoners and possibly pups would have an easy time xping because they can solo T mobs and everyone will be like... WTH?!? Then think about weapons, armor, spells, etc etc from 75 - 80.
This game wants you to use massive amounts of teamwork and coordination to achieve your goals. From simple missions, to AF quests, to dynamis and assault, to even leveling your job Raising the lvl cap won't solve anything. SE would treat it as a balance.. if pc players get 3 times stronger, then all mobs in the world must get 3 times stronger as well. A delicate balance... Only thing that is gonna happen imo is that SE will make the mobs stronger in order to give the pc players more of a challenge to 'get the job done' if they see us killing endgame mobs too easily. For the other way around.. they'll give us clues on how to make our lives easier, like when they gave us a clue on how to 'tame' Absolute Virtue.
OK, typed too much.. gonna stop now...