Ideally RDM would only be 2% at most behind BLM and melee. That's more than enough tax.

But I can see the idea behind the suggestion. Let's say it was a temporary damage down that resulted in about a 3% dps loss over a raid fight. That would mean RDM is pretty much the same just with more damage and only receives the current utility tax IF they use their utility multiple times. So RDM would actually be in a much better spot than it is now. Everyone up in arms and calling it a terrible idea isn't really thinking it through.

I still say no because it's a compromise and accepting the flawed idea of dps tax in a game entirely focused around dps, instead of a fix.