Meta should not be nerfed. It's not that simple of a question.
Do we like the current meta? Does it provide fun and varied gameplay? If something in the meta is too prominent and results in gameplay that is not fun, what can we do to improve it?
There are ample tools for this and it's all about identifying the core issues before choosing what to do. You might instead want to buff something to counter-play the meta. Another solution is to make something that is already strong simply more fun and attractive to play. Solutions like these breed variety without taking away from existing meta if there are fun aspects to it already.
Games often have "sleepers" which are features/abilities/strategies that are under-used in the current meta, but are in reality very strong. Players not using them can stem from something as simple as it not being discovered yet or it being boring or uninteresting. This is something
@Gargos was alluding to.
Seeing Saber/Sniper meta for instance might not be directly from the classes themselves. Perhaps the map's design favours classes with these types of toolkits more than classes without them? Perhaps they're more cooler to play? Maybe they are easier to play, but don't have a skillceiling that is as high as for another class?
Small instant action maps like Smuggler for instance make snipers less common place as there aren't that many situations where you'll need to use a sniper. On the opposite side of the spectrum there are maps like Coruscant Chase which always makes most of the imp team roll mandalorian or Duel of the Fates where both teams pick a lot of snipers.