No... we can't say that for sure because IDENA economy rewards you for high score which is impossible to get validating 2 nodes. It's better to have 1 good node than 2 shitty with high risk of failing validation on one of them. Majority of people that i've spoke has 1 node per 1 person. Some of them have few nodes but each of them is being validated by real life person (f.e friend/family member)
I have talked to many people who think it is better to have three nodes with a bad score (and to participate in mining) than one with a good one. Obviously, I do not support them and therefore, I have only one node.
Okay, maybe this is not half of the total. Quarter.