On my time before I deleted my WL, partly due to this change and the reception it received. I noticed that of all the DPS classes in the game WL was the epitome of a PUG slayer class. By design the class heavily punished not playing properly, especially in the case of being out of position without guard/peels and heals (the most common mistake). You'll notice in that latter statement it's implied that being in a proper group is required... and it is to deal with pre nerf WL who has a premade behind him (notice I don't say 1v1).
There is a phenomenon in gaming, were a certain class/hero has a kit that is seemingly built around punishing something that the casual playerbase at large is guilty of doing. I could go on forever with a few examples, but in this case I'll just use the recent game overwatch and its hero Roadhog as an example.
Roadhog has a medium long range "hook" ability that pulls anyone it touches into extremely close melee range, enter his shotgun... and you have an extremely nasty 1hko in a lot of cases just for simply being hooked. Now in the competitive scene, and high level play players actually play like a team and don't run around like chickens with their heads cut off, they play behind their tanks and their shields and push as a group which can save a player who gets hooked and down a hog in seconds thanks to his gigantic hitbox and limited mobility. But in PUG play, people rambo in 1 by 1, they don't push as a team, and they don't think of the game as a team game so much, so they lack the countermeasures like say a zarya bubble etc... So every day you go on gaming sites, Bnet forums and there would be thread after thread after thread of NERF Roadhog, and thankfully after months that's never happened because blizzard hasn't given in to it's casual playerbase.
I really believe WL to be a very similar case, just replace hook with pounce. It's my opinion that this change was giving into a pug argument, and I'm sure most of you want to crucify me for saying this.
Regardless, after saying all that do I think WL isn't viable anymore? No. WL is still a top tier DPS, but there lies a very big problem with that. Ask yourself "Would WL still be good if it didn't have the armor debuff", and you begin to see the class is pretty much held on by a thread called force opportunity. Any changes to armor, as discussed in the state stabilization thread, or changes to the meta in terms of entry of classes with armor debuffs (like IB), can drastically sway WL's place in the game/meta. But if we look to mara, who has the mirror ability, that class is still perfectly viable without cutting claw. I've recently been playing the monstro spec in ORvR and it's a shining example of what a MDPS should be in large scale ORvR fighting, and that spec doesn't have cutting claw or even thunderous blow. And even from a single target perspective, losing cutting claw isn't the end of mara for a myriad of reasons.
I want to go on a tangent first before addressing white lion part in your post
I dont feel that mara should be the standard we hold WL or any other mdps to, because quite frankly the jack of all trades, amazing at everything class is just overtuned and are just simply too good in my eyes and needs to be brought down, rather i feel that it is slayer and choppa are the standard that mara and wl need to be held to, strong classes but not on their own and need support to truly shine.
Ofc the WLs skills and trees need to be redone, getting rid of the PvE garbage and give it some real skills , but people will need to really decide whether shammy and herders with run away! is still such a huge problem that they want wl to be about target catch or whether they want the class to be a more general purpose mdps.
Wl without an armor debuff would still be good if more of its kit was spirit dps cause then it could still synergize with SM but no high armor debuff would hurt slayers dps a bit