I seriously doubt that the Conquests are going to remain as they are at the moment. The Gauntlet is no alternative to them in any way if you are looking for top gear. The heal timers seem to be very low, the time limit for passing the dungeon is very high and even the "boss" Nightmare opponents aren't that hard to beat in a few runs. Worst case scenario - you end up with some purple after less than an hour, no gold or trophies spent. Best... is orange of course. So the "promotion" will probably be for 1-2 weeks, like it was with the Gauntlet, and then we'll see something more challenging and expensive.