Whether your thesis is a conspiracy theory depends on what you're implying about the motives of those involved. There's no denying the existence of an international elite that meets regularly and quietly "works things out" among itself, but I question whether that's really because all those people are consciously working toward a "One World Government".

I don't think so. Rather, I think that causality's the other way round, that globalization has created a need for international institutions of governance, and in the absence of formal institutions like that, people are improvising frantically, with nongovernmental organizations, international treaties and commissions and "coordinating bodies". Modern nations need an institutional infrastructure to enable things like commerce (banks, courts, etc.), and logically when those activities expand to an international level, they too require and benefit from similar infrastructural institutions.

That doesn't mean that I approve, because the result is institutions that serve the needs of the elite that created them. Since we need those institutions, as demonstrated by the fact that they're already being created on an adhoc basis, the logical solution is the opposite of where you seem to be going: Embrace the concept of a world government, and take charge, just as our ancestors did two centuries ago, to create a global government that serves us all.

Sitting this one out is not an option. We'll get an international order of some kind, so we may as well take the initiative to try to get it right.