It will do the exact opposite, because there will be no actual resource to learn off of. Addons have been teaching the game for decades at this point, and any one new person who will jump in is bound to be absolutely screwed due to the sheer amount of stuff in the game. That has already been the case even nowadays, and it’s just going to exacerbate the actual impact once everyone doesn’t have them. Those who will have played with addons before will be miles ahead in game knowledge going by feel and memory, while those who haven’t will just be clueless as they’ve always been, except with no tangible way whatsoever to have a possibility to catch up.
You’re talking about learning to beat a shark in its own waters while sending people out to the sea without a harpoon. Addons have been diminishing the skillgap, not widening it.
Since you’re a mage, let me know in Midnight how enjoyable it is to get oneshot by a marksman through the wall in 2 seconds where you can’t even see the animation without addons shouting “TRUESHOT!!!” unless you know by heart and notice the innocuous 0.5 x 0.5 cm icon under their ingame HUD with the most awkward positioning possible while your healer fails to notice their priest’s 0.7 second mass dispel cast on your ice block without being prepared to react because he will be too busy trying to figure out wtf is going on since the healer won’t even be his target and nothing in the game teaches you focusmacros exist and even if they do use them, they typically use them for you, not the enemy - provided they’ve first googled for an hour and studied basic coding on how to write one to begin with and got it to work.
The game as a standalone is a jank, convoluted mess and teaches you literally nothing. Addons have been amending for Blizzard’s incompetence - especially in PvP - for years on end.
It’s not a problem addons exist, it’s a problem that the devs haven’t implemented the functionality into the game themselves, and haven’t taught you how to use them. Blizzard doesn’t teach you how to play the game, and they should. But alas, that’s money.
I have, and I can tell you with certainty that I will remain there, and the reason is simple:
I’ve been using addons for 6 years and they allowed me to close the skillgap by teaching me about the game. Now I possess tons of knowledge I would have never obtained without them, and those who didn’t have this opportunity will now be forever behind, unless they invest hundreds of hours into research and thousands of hours into actual practice.
I can also tell you with certainty that without addons, I would have never closed the gap. For example, my first season ever (BfA 2) I reached 1673 cr. The next season, I learned about addons and rocketed from hardstuck 1.6 to 2031 cr. The next season I optimized the usage and reached 2512 cr and have been maintaining elite since. None of this would have been possible without addons at this point.
I won’t be needing addons anymore, because all the game knowledge is now burned into my brain. Anyone trying to catch up with me however - let alone those better than me, of which there are plenty - will now be presented with an impossible task, because any one time they will face somebody who used addons before, they will be miles behind.