Thank you everybody for providing the answer I was seeking! This is exactly what I thought was the case and now I have more opinions/links to back me up.
The thing is our submission doesn't yield a unique Thank You page. Instead it wipes the form and reveals a Thank You message in the form's place. For whatever reason this is how my boss wanted it done and I disagree and want a new page to come up (even if in a new window) to ensure an event's triggered and analytics doesn't lose it.
Mark - Is there any sort of "event" that I can trigger which won't load a new page or affect anything the user sees per se? I feel like my only option here is to do as EGOL is saying. And to be honest, that's what I want to do anyway. Why would a user want to stay on the page they were just on after filling out a form? What use is that page to them after they've filled it out and are waiting for a response?
Bah! I swear 80% of my job is convincing site owners that they're thinking is backwards and having to essentially "argue" (for lack of a better word) with them about it.
Anyway, thanks fellas.