I will believe that Google can figure out a way to filter the spam – I mean, beating the spammers was their core value-add that made them what they are today. The spammers have pulled well ahead for maybe a year, but Google can maybe figure out a way to pull ahead again.
But there is no way that Reddit is going to be a reasonable forum site without a way to search it. Maybe it doesn’t have to be Google, but they have to have something sane.
Even aside from people searching, some people contribute specifically so that the information they provide can be found by people searching down the line. If it’s just going to a black hole…