Only advantages to buying Burning Crusade before you are level 58 are:
1. Want to become either a Draenei or Blood Elf.
2. Want to train in Jewelcrafting.
3. Want to visit the Draenei and Blood Elf islands early, which is nearly pointless unless you want to get their mount.
4. You can have a lock summon you to BC so you can train in higher proffessions.
But to answer your question, at 58 your character can travel between both worlds at will, so your character will not be stuck in BC.
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