The answer is yes and no. You can level up crafts and make upto ilvl 90 gear, buying the myth materials from the market board. Do treasure maps and bestman dailies to earn myth at a slow pace. Or odd roulette dungeons just for a boost on myth. Supposably they are increasing myth drops too at some point, maybe 2.28 which "should" come next week if it is still slated for this month.

Also other activities outside dungeon crawling are coming. We already have gardening, plus golden saucer and chocobo breeding are listed as being added. Personal housing also which will occupy players time.

But simple answer, if you want the gear fast, then yes, dungeon crawling, If time to acquire gear isn't a problem. then not so much.