I think a re-read of the Service Letter is required.
If you have Aluminum Blades P/N C016-7, ignore the Service Letter.
If you have C016-2 or -5 blades, they (RHC) are offering you a discount to upgrade to the C016-7 blades right away, if you wish too. If you do not want to change your blades, then don't. There is nothing in the Service Letter that says "you must do this by a certain date or else". I have still have two R44's and one R22 with the Stainless Blades, we have no plans to change them out until the 2200 O/H.
I don't think it was intimated here that anything in the service letter mandated main rotor blades be replaced.
But in my opinion, this SB and offer to reduce prices is certainly not a good will gesture by Robinson. No, I think this is a precursor to an AD that will mandate another round of blade replacement. Don't forget about the proposal last year for comments on the potential AD that would mandate main rotor blade replacement. !!!!
Why else would they offer the blades at such a discount? Goodwill?? Yeah, sure.
No, I think Robbie wants to get those blades off their ships and this is step one in their plan.
I hope I'm wrong, but past is usually prologue.