Most fans undoubtedly know that in the comics, Tommy goes by the superhero moniker of Speed and eventually joins up with the Young Avengers.
Quicksilver and Speed co-existed in the comics, so the same could definitely be possible in the MCU.
And based on the finale’s post-credits scene, there’s a firm chance we haven’t seen the last of the mischievous young hero.
I absolutely have to point out that “Fake Pietro” wasn’t the only speedster viewers met in WandaVision, as the series also introduced Wanda and Vision’s son, Tommy.