If we had in place a social norm demanding an adequate amount of background knowledge on the topic before anyone voiced an opinion they expected to be taken seriously, the signal/noise ratio might be somewhat improved.

Unfortunately that'd skew things towards the status quo.

Advances in knowledge often come from taking a very different angle on a problem, by someone who isn't immersed -- and thus not necessarily knowledgeable in -- the existing viewpoints about the problem (e.g. by amateurs or people from different fields).

Ultimately a person's view should be judged just on its own merits.