In a normal solo I get 45k points on a deathless. so 725k divided by 45k is 16.1 and some change, effectively making the drop rate 1/16. I can do 7-8 min solos, so take 16 times 8 minutes =128 minutes, making hitting your drop rate a little over 2 hours, a raid scaled for 725k points as a solo would take over an hour. possibly "well over" an hour, so there's not much of an impact from a method like this.
And I would personally volunteer to do the testing runs of it in beta, seeing as how it would be a big-time commitment to test something like this.