The kebab was introduced in 2021, yet today it's only used by a handful of products (Envoy/Passport, Lightspark, LNMarkets, Thunderhub). There isn't even consensus around it among bitcoiners, so there's almost zero chance of it ever becoming a Unicode symbol, which puts it on a death spiral it has been in the past years (no unicode symbol > no adoption > no unicode). On top of that, the kebab resembles the ETH symbol (Ξ).