Kurotowa
Legend
Right now there's three easy ways for a Rogue to pick up Green-Flame Blade or Booming Blade. Be a High Elf, be an Arcane Trickster, or take Magic Initiate as your Background Feat. None of which cost an ASI, and all of which raise their max damage potential.I dunno, if someone is spending a bunch of ressources like a feat instead of ASI to get Green Flame Blade on their Rogue because they like to do BIIIIG DAMAAAAAGE then maybe I'd let them enjoy their BIIIIG DAMAAAAAGE for a while.
It's a situation I'd be more worried about if Rogues weren't a little lackluster in the damage department. An extra 1d8 or 2d8 is not going to overbalance the class. Not unless the final release version has some significant differences from the UA6 version. As it stands, though, it's a cute little way to score some extra damage, and it has its downsides. You can't get an off-hand attack from dual wielding from the cantrips, and you can't use them with a reach weapon like the whip.
So overall, the status quo doesn't bother me as much as this alternative.