I think at some point, things will be changed. Usually, devs care for players anger. Unless the new direction don't and decided to not listen their player base anymore. But it would be the start of the end. Rose medals are free stuff. And their is no point on risking whale players money to keep free stuff hardly limited.
For devs defense, it's the sames rates than the original event with almost same rewards (there was even more rewards). It's just not adapted to the new event format. I'm sure they will manage to fix it.