If you only play for the leveling storylines and voiceover, which are great, keep in mind that there are 8 different classes and 8 different storylines (4 on each side, republic and empire) to enjoy. There are also side quests, hidden datacron quests, companion quests once you get their affection high enough and of course PVP if you're into that. This could keep most players going for a year easily. More importantly, the longevity of most games is dependent on the activities you do with friends and guildmates. If you aren't running with people you enjoy hanging out with, you could lose interest quick regardless of how much or how refined the content is. If you shelve it now, it's likely you'll shelve it soon after your return in 6 moths for the same reasons. That's why we're trying to build a gaming community with Cosmos.
Good luck to you.