The solution there is to take the feat if you want to multiclass, so you can continue to use higher dice as you gain levels. Although it is a little strange that wild talent scales with levels, whereas similar feats do not.
— Crispy K (@aaracokra) April 15, 2020
Some Feats do. Ritual Caster scales by overall level, Inspiring Leader. What similar Feat are you thinking of that doesn’t scale? Wild talent is akin to Martial Adept and Magic Initiate. MA only ever starts scaling if a BM Fighter takes it and the scaling of a cantrip from MI cannot possibly be compared to the scaling of the psionic die which is closer to the 1st level spell in functionality.
— Crispy K (@aaracokra) April 16, 2020
ah, forgot Martial Adept. That would be a good one to scale as well yeah. But now that you've reminded me, it's even worse for that than you're thinking, even if you're BM Fighter it's only ever a d6
— Joe Miller (@neoman4426) April 16, 2020
If you're a Battle Master fighter and take the Martial Adept feat, the superiority die from the feat improves when you gain the Improved Combat Superiority feature, which intentionally makes no distinction between a die you get from the class and a die you get from the feat. #DnD https://t.co/bmzjTrXVzn
— Jeremy Crawford (@JeremyECrawford) April 16, 2020