I'm not sure I'm following you because decision making is already what happens in SMN / RDM's adaptation to a given "Raise" situation.

The big problem is how severely punishing "raising tax" is to RDM and SMN's performance currently, when raising does not happen that often, and is not so much of a game-saver (as it usually leads to enrage in early prog/low gear runs). Raising is mainly healers' job, so there are two raises before considering sacrificing one GCD (and perhaps some MP) for SMN and RDM. Having a dead healer is another niche situation which cannot weigh so much in the balance.
In the case of RDM, chain raising is even more a self regulation as it's hard on the MP.

My point is that Raising should not be considered so severely for balancing DPS, especially if it leads to scraping out a bit of identity to these jobs; in the current state of fight design it does not mean anything anymore. For me RDM (and SMN) balance should be balanced around mobility, rotation difficulty, optimization and their party buffs more than raising.