But Americans aren't going to be exposed to the British The IT Crowd dependent on whether or not the US version is made. BBC America does show a number of British TV shows (not exclusively BBC, notably) that aren't shown elsewhere. They showed The Office before the US version was made, for example. Coupling, too. They have not shown The IT Crowd to my knowledge. If they haven't by now, it seems unlikely to me that they would in the future.

So the possibles states of US viewers seem to be "already aware of TITC"; "not aware of TITC and will remain unaware"; and "not aware of TITC but will become aware when the US version is shown". It seems to me that the only outcome that will increase the likelihood of people to be exposed to the original is by showing the US version.