In light of the question Can you provide me with some evidence of a young earth?, there will clearly be dissenting views.
As the question is worded, providing these views here would be off-topic.
I can see a few possible courses of action:
Re-title the question, so that dissenting views are not off topic. Perhaps Is the earth Young or Old?
Create a counter-question Can you provide me with some evidence of an old earth?
Allow dissenting comments
Consider dissenting views argumentative, non-constructive, and off-topic.
I think, and hope, that we can rule out #4 (so long as the differing viewpoints are presented in a helpful, non-argumentative, and constructive manner).
I expect #1 will make some questions absurdly long--not to mention it makes it harder for the OP to select a "right" answer.
If we go for a question-counter-question format, I can see there being a great number of "twin" (and in some cases triplet, quadruplet, etc) questions on the site. But maybe that's not a bad thing?
For instance my question Was the flood of Noah global or local? might be a candidate for two questions, one asking for the evidence of each. That would certainly make my job of selecting an answer easier. :)
Clearly, if we go with the multi-question approach, the related questions could reference each other.