My comments on CL: I just want to say, it has been really refreshing seeing a hero besides the DK being viable for Undead. Despite the number of people who complain about CL, the two best undead players still play the standard DK + Crypt friends, at least to my knowledge. If CL is further nerfed, then it will probably never have a chance at being a real option, in my opinion. Many people may say CL is being picked more often, but Archmage with its Water Ele is almost always chosen first for Humans. Being picked more should not equal being overpowered.
If anything, the CL beetles have provided what the undead race has always lacked: a strong T2 melee equivalent, since ghouls are too weak mid-game. Humans have spellbreakers, and orcs have raiders, but UD has always been lacking in melee unit choice before abominations. Unless CL is used by the best UD players instead of the standard DK + Fiends, I would hope the Blizz team will allow the CL to stay strong, because the same Death Knight + Fiends combo has, at least from my perspective, negatively affected Undead as a race for the past 15 years, both from a viewership point of view as well as from a playability point of view.
If I were balancing, it would be the impale that would be nerfed and not the beetles, because if the impale is strong, then UD will simply always pick it as a third hero (we want diverse 1st- hero picks, not always DK + Lich + a diverse 3rd- hero pick). Beetles, like any summon, are far weaker lategame, so weakened beetles won't effect people who just pick CL third for its impale as a supplement to its Nova/Coil power.
If anything nerf is required, I suggest put make beetle burrow dependant on the research for crypt fiends' burrow ability.