Lucario's huge drop will be his speed. Landorus-therian, Thundurus-i, latias, latios and a wealth of other speed 110 tiers go back to becoming a great check/counter. The overpowering power is gone (Although crunch coverage moves are now stronger). Landorus-therian/Latios are going to harass it now, unfortunately, and conkeldurr will become the better fight type. Hell, Infernape might see some usage now because it isn't completely outclassed and has some pretty good coverage in fire/fight.
Except almost all of Lucario's offensive checs are hammered hard by +2 ESpeed:
+2 252+ Atk Life Orb Lucario Extreme Speed vs. 4 HP / 0 Def Latias: 242-285 (80.1 - 94.3%) -- 43.8% chance to OHKO after Stealth Rock
+2 252+ Atk Life Orb Lucario Extreme Speed vs. 4 HP / 0 Def Latios: 266-315 (88 - 104.3%) -- guaranteed OHKO after Stealth Rock
And Lando-t can't take Ice Punch that's for sure:
+1 252+ Atk Life Orb Lucario Ice Punch vs. 252 HP / 244 Def Landorus-T: 530-629 (138.7 - 164.6%) -- guaranteed OHKO
+2 252+ Atk Life Orb Lucario Ice Punch vs. 252 HP / 184+ Def Gliscor: 536-634 (151.4 - 179%) -- guaranteed OHKO
Conk can't OHKO with Mach Punch (72.5 - 86.1%) while in return a +2 Close Combat OHKOs (and +0 CC followed by ESpeed has a high chance of KOing too). Granted, Life Orb will take its toll. Slowbro definitely walls it if it carries CC/ESpeed/Ice Punch though, and that's why Luke has 4MSS as I explained in my previous post.