A couple of things to note on this. At least in the linked discussion below, the view at that time from @artkaseman was that the diff between active collators between Moonriver and Moonbase shouldn’t be more than 8. If the number was lowered on Moonriver below 68 it would violate that previous view, but maybe it would be considered acceptable now.
Without speculating on price, looking at the economics of collating on Moonriver is an important aspect of this.
Currently a collator will expect to earn around 100 MOVR / month in rewards, or somewhere between $400-$500. This just about pays for professional grade bare metal server + 1 backup in a top tier data center, and says nothing for labor. We don’t know the reasons why P2P and StakeFish are ending their services, but I think it’s reasonable to assume the economics was a factor.
The point I’m trying to make is that if we don’t speculate on price, the economics of running a collator today would likely only be attractive new collators that are hobbyists with the technical skills to run a collator, who also happen to have 10k in bond available.