RDM has been a soloer since the early days, but it was designed to be versatile..and it actually needed adjustments to be caught up. RDM is powerful but you didn't see a mass shift towards RDM like you did BST for a specific reason. It's not better what BST were doing, nowhere near - you even need more as RDM to do what a 'typical' BST could do. As said, it's not a problem that BST got powerful..it's the circumstances around it that drew attention. They wouldn't have developed the magic resistance patch (every real mage from back in the day knows this well) or develop ToAU around the brunt of the content being less mage friendly progression wise (i.e leveling wise.)
(It needs x people to start it!)
Anyone who's been playing XI for any length of time knows people run additional characters themselves to start content, whether you should or not. So the whole solo thing isn't a problem, people wouldn't be going to BST or wanting BST parties only for stuff if things were "fine" you know?
As much as people are trying to drag Samurai into this, outta saltiness:
The initial 2 handed patch allowed Samurais to deal insane damage while naked. Guess how fast they reverted that patch even though it only affected SE's lovechild?