I can empathize with this feeling. And while there's no telling how long we'll have to wait for the other classes to get spread around, it's possible (if a bit unlikely) we'll see other classes opened up during Dragonflight. I'd say it's almost a guarantee though that 11.0 will see most (if not all) of the remaining classes opened to the races that don't have access yet.
The sticklers will really be demon hunters (requires model work for race specific demon forms and animation work since only the elves have the animations for dh abilities, and of course a bunch of lore work), and druids (race specific forms... and that's a lot of model work considering only 3 alliance races and 4 horde races can currently be druids, nevermind all the lore work).
Monks I honestly think will get added to worgen, goblins, and lightforged at 10.0, and not including them with rogue mage priest was either an oversight or blizz covering their asses in case they couldn't fit it into the pipeline. There's no real reason those races cant have monk right now. They have all the monk animations already. They might just need an npc or two plopped in their starting zones for anything class specific.
Locks are primarily a lore issue for some races (draenei, lightforged, night elves, etc). That's handled with a few npcs and some dialogue, maybe a small quest. Easy stuff.
Paladin is a breeze to do too. Only model work needed is race specific mounts. Lore additions is the most needed to explain new paladins, and maybe Blizz might wanna recolor abilities for certain races (like NE pallies having soft white light of Elune looking spells).
Shaman isn't too bad either. Only model work needed are totems, and in some cases Blizz can copy/pasta an existing race's totems to a new one (like copying draenei totems to lightforged) and maybe give them a recolor. Some lore sprinkles will probably finish it off. I'd say Shaman is the most likely to see shared during Dragonflight (if any get shared at all) given the fact that we'll be dealing with elementals and such on the dragon isles.