@Sunny2 you say 7*s coming into the game is different now than when 6*s came into the game. I just want to know, when 6*s came into the game, were you an end game player with multiple r4 5*s at the time?My hypothesis is that the game isn't in a different place, it is you're in a different place. In the past it was hard to get and beat end game content like act 5 unless you were good. However, in recent times, act 6 is a breeze to get through, and so is act 7 and 8.1. It is much easier to hit end game placements now than it ever was in the game. Also, at a minimum, 7*s aren't coming for 1.5 years (the release date of 8.4) when we have a ftp way to r5 a 6*. That's a lot of time, and by then we will likely have lots of our favorite champions at r4 sig 200. Something will have to give for us to continue to progress because a lot of people are now just saving shards for the next 6* featured to get the shiny new champions since we have most everyone else on our roster already.
The initial plan was to have them launch together, but we didn't want to launch 2 major new additions to the game at the same time. Too much potential for things to go wrong. We'll have more information on Relics for you in the next month or two!