Yes, yes and yes! Why limit topics to stuff where there's no objective answer? There are a lot of people (including people with 20K rep+ on SO) who quit SO in disgust and who would just love to share their knowledge on both objective and non-objective question. Pivot immediately. Do both objective and non-objective : ) Instant winner IMHO, going to help people there immediately!
On the objective comment, the format actually does work for objective questions just fine without us changing anything. We just excel at subjective questions so thats how we are positioning ourselves.