I reckon it's a good thing. Lets face it a lot of people complained about olds being released but did it not make pk more interesting? I think so.
This way everyone can compete against baba's repping +9/3's were previously they wouldn't have been able to, especially back in the days of questies and rentals.
That's assuming the drop rates are ok from the summon staffs. I remember doing a few of them on myko and got nothing, plus the most common boss was kecuri, for me anyway.