T4 is easier to do, to lead, esp. if you brings alts.
I don't try to say that t5 will come sooner, but i think you can bring all the loot you want with awesome drop rate, this kind of thread will rise again due to the nature and core issues of T3.5.
But as i said before, i wouldn't mind a little increase of % loot chance if you think it will encourage players to do Erlik. It will have a minimal impact for a minimal time, but maybe it will be enough to retain some players until next content ?