I suppose the only possible downside would be if Bridles are added to the new LI system in the future, in which case you would have already spent the components and would not be able to easily replace the old bridle. I have no clue what they actually intend to do there though, and it doesn't look like they know either. =/
Really dreading leveling my next toon to Rohan areas now, with no way to make a new LI Bridle, and having to actually do mounted combat in those zones.
~Erynaur, Champion of Crickhollow
~Butterpea, Hunter of Crickhollow
~Mylwen, Captain of Crickhollow
~Mistmir, Loremaster of Crickhollow