Hi. I disagree. OSMNotes is a feature to notify mappers of potential or definite errors. I stumbled across this issue during a maproulette quest. I surely will not take the time to find out who mapped this, see if he/she ist sill active and contact him/her. Other Mappers may well check this; that's what OSMNotes are for: that any mapper near this place can go check.
And closing a note which shows a potential error with the notion "won't be closed/solved for a long time" is neither a solution. Notes can be open for years until someone closes them since they are either outdated, deprecated or already solved. 

I apologize for directly saying that it should be checkd on site. Anyone with the knowledge of the current situation at that place can do this directly. Again, this is what OSMNotes are for.