A quick question about the viability of changing classes with different primary stats.

How gimped would a class be if I were to switch from a primary Int class (BLM, SMN) to Dex (BRD)?

To give context, I've levelled up THM to 26, ARCH to 15, and ARCA to 15 and dumped every stat point in to INT.... but I'm considering switching to ARCH/BRD at this point. Would my Bard be gimped, or would it be fairly negligible at this point to make the switch and just dump the rest in to DEX?

Thanks