I'm not sure I see the necessity for change:
1) TK get the same # of leaders per 1k as Dwarfs, Elfs, Chaos, though they are "only" wizards.
That's true, but it's only half the truth.
Let's make a list:
Armies with 3 characters for 1000 pts: DE, Dwarfs, HE, Chaos, Daemon, Arab (?), Undead
Armies with 4 characters: Emp, Skav, Bret, Kis, Vamp
Armies with more characters: O&G, Lizardmen
I think it's quite clear from the above that there are three categories. The first are the high quality armies with presumably lower breakpoint and tougher units (Kislev seems a bit displaced here) - they will normally have less units therefore need less commanders.
Then there are the medium armies and the "swarm" armies.
To be honest I cannot see any reason why Undead should be categorised as high quality army. They seem much more like all the other medium armies - and their breakpoint at 2k points mostly lies between 12 and 16 (taken my experience) - this number needs a lot of characters I'd think.
Furthermore the army that's most similar to Undead - Vampires, have 4 characters, too.
Of course all armies with more characters have one character class with command 7 (Skav even lower), so I think Claus's suggestion is perfectly fair.
I think it's quite strange that there are voices here that seem to say - "Well, just take less units and you'll need less characters!"
Especially Undead should imo be an army where hordes and hordes of terrifying skeletons should slowly come out of the desert sands to take the lifes of unwanted intruders. Why restrict that? That should indeed be a playable option.
I totally agree with Claus.
Greetings,
Gerald