Eventually they will have to stop using this system to identify gear power. The numbers keep rising and in the end we gonna end up talking about i1010, i960, etc. It doesn't look very nice. It was a nice system when it started and we had gear ilvl close to player's lvl but now it went too far off. It will not be easy to remove it as it has implications with dungeons, DF, PF etc. A way to deal with this will be to simply remove and replace the minimum ilvl requirements with minimum stat numbers like critical 800, min accuracy etc. It can also open the door for more horizontal gear progression. In other MMORPGs you judge the power of gear by the color of it (icon color) and simply the stats it gives. Here we just go for bigger ilvls overlooking stats in the process.
ofc it will not be that simple but maybe devs already thought on this.