I am well aware i had more than 40k gold on this server wtf
Do you really think that the average raider on the old realm had that much money, and it was related to the 5g respec cost in any way? I can think of a handful of individuals with such ludicrous amounts of gold: yourself, Dagrus, Fei, Timecop, Reasonabull and a few others. Did you farm DM North for that gold? No, you (collectively) abused the bugged plaguebloom spawns, controlled static black lotus spawns, abused alts leveled with the 7x-xp event for profession cooldowns like arcanite or mooncloth, and controlled the auction house. The average player on Kronos didn't do this, just because you ruined the immersion of ingame cash having any value for yourself by abusing mechanics that won't be available on the fresh realm doesn't mean it was so for the majority. But hey, better try and make others remain even poorer with an imposed 50g respec for swapping specs so you can roll a hunter again and remain on top of the economy by your class having the best farming option out of any (soloing dm n).
The people who just want to kill others as retribution or balance or whatever won't magically become amazing teamplayers that never get cc'd and always time their cooldowns perfectly, instead of it they'll keep playing their niche specs and just run pug raids or raid in guilds that let them play their dps specialization without care for others. Not to mention that repentance is actually a pretty good spell to have for pugging when you can't always count on having decent peelers/dps that can cc in your team. Instead of an influx of healers you'll have an influx of fury/prot warriors, ds/ruin warlocks, ap/frost or later combustion mages and moonglow druids without feral charge in your wsg pugs.
Respeccing being more available also doesn't mean that every class becomes a frost mage for farming, for example as a priest you'll make money faster by just farming felcloth or silithus pages by aoeing with holy nova rather than speccing shadow and running oom after killing 3 mobs, as a druid you just want to team up with a warrior or level a farming alt yourself etc. Obviously you can also make gold with professions, but those aren't linked to specs anyway.
Pve also won't become super hard, or niche specs more common in the game even if you have a higher respec cost. You are playing vanilla wow in 2018, obviously the tryhards are going to optimize whatever they can to make for more dps. (Seriously, have you looked at Vanguard, they're having people level multiple characters to run double ID's and require their raiders to pick certain races. These people won't give a damn if the respec is 5g, 50g or 500g, they're going to optimize their raid either way.) With 50g respecs mages will either farm a bit after a raid because it's pretty easy to make 50g as a mage in DM E or just play alts for MC/BWL once AQ40 (where they'll want to spec fire for the first time) is out, because you know that with AQ40+ gear you can just stack physical damage to breeze through any blizzlike raid. You simply won't have people raiding Naxx in Elemental pvp spec like I did in 2006, because the attitude around this game has changed completely. Vanilla raids also won't be hard no matter what you do unless you absolutely rework some abilities, for the love of god feenix buffed their naxxramas four times over the retail values, and they still had backpedalers with no keybinds getting carried through the entire content because vanilla mechanics just happen to be that simple.