hold up, you're 59? GREAT! i need a 59 RDM friend who knows what he's doin. LOL. though you'll be continuously getting competition from other great RDM friends i've met along the way. ;)
jokes aside, it's your life in FFXI. i don't think people can make the decision for you, but i heard that a lot of BST quit in the end too cos they still need help for many of the quests (e.g. AF).
seeing that you've already done G1,2,3, i don't think you'll have any real problem getting to 65 as a BST. however, i suggest keeping your rdm items on a mule or something in the event that BST proves too much. it's not an easy job at all from what i've heard, and it takes 2 times as long, usually, to lvl until you get 'leave' and form bst duo-parties. maybe a read on the bst forums would be more insight?