I wouldn't fret. When an expansion comes out / level cap raises and SE wants "everyone" to be able to continue the "Main" story, you're going to find that the level 50-60 gear that you get from main story quests are better than the current i-level 90 level 50 gear.

SE is following the WoW method now. When the expansion main story comes out, SE wants everyone to be able to play together again and there will be a brand new grind after the expansion main story quests (with everyone starting on equal footing). The only players not used to this forever repeating cycle are those who played FFXI. In FFXI you could hold gear superiority for countless years. With other MMOs, everything goes out the window each expansion release.