Nice strawman. Let me spell it out to you again:
The characters who primarily benefit from the teleport spell are the pure caster classes--Wizards, Priests, Druids, Necromancers. They find lots of spellbooks, so are quite likely to find one or more of teleport. They learn spells easily, so can get many, many castings. They are likely to have high Le, and are likely to be races with spell learning bonuses--elves, primarily. They have, by mid-to-endgame, huge batteries of PP, so they can teleport very frequently. Because these characters are the major beneficiaries of the teleport spell, they are the ones most affected by the nerf.
The characters who experience no effect from this change are the pure melee classes--Barbarians, Beastfighters, Farmers, Mindcrafters (not technically melee, but same problems), Chaos Knights, Fighters, Thieves, Merchants, Rangers, Assassins, and virtually all Trolls. These characters rarely find books, so unless you save Khelly, you probably won't see it anyway. Even if you do find it, you have class-based spell learning penalties, no concentration skill, and probably racial spell learning penalties as well. They tend to have lowish racial Le as well. These characters are lucky to max literacy before level 40. They have tiny amounts of PP (except Mindcrafters). Most of these characters will probably never learn/cast teleport in any circumstances, so they aren't affected by this change. This represents, not just the bulk of all class, but the bulk of classes that we typically call "melee characters".
The characters who experience some effect from this change are the hybrid casters--Paladins, some Bards, Monks, Healers, Weaponsmiths, Archers, Elementalists, Duelists, most Mist Elves. Most don't find many books, so probably won't see this spell without saving Khelly, but most of them have literacy and concentration, medium Le. They have some book learning penalties, and learning spells with the dumber races is still pretty hard. Their PP batteries are still pretty small (except Elementalists). If they're lucky enough to find a book, most of them can probably learn teleport at high level as long as they aren't a troll. Are they hurt by this change? For those who find the book and read it, sure. Are the affected as much as pure casters? Absolutely not. Is it a crippling nerf to them? Absolutely not--at worst, they end up playing the same as the characters with no access to teleport spell at all. More likely, they can cast it, but their limited PP batteries prevents consecutive castings without a recharge. Not that big of a deal.
Conclusion: This is a nerf to all casters, including, to a lesser extent, hybrid casters. The more you cast, the stronger the more you'll notice this effect. Melee characters, who are, for the most part, non-casters, aren't penalized in any way. By making it more difficult for casters, the huge gulf in difficulty and ability between casters and melee is lessened. That was the intended effect.