If the earth was flat would flat earthers argue that the world was round?

Spherical*

If you think like I do, then yes. My belief is that they, at a higher level, are just trying to point out how dependent we are on the collective knowledge of others who came before for our own base knowledge.

This, of course, doesn’t apply to rank and file followers and is probably too optimistic.

Only if there was strong evidence to show the earth was round