While you say the post is "not doing much" I'd be careful not to leave that I beam unsupported for too long. Generally speaking builders don't add things that are not needed.
If it were me I'd do what HayZee518 suggested except I'd get that support post now and at least have it firmed up between your floor and the I beam above add a piece of 2 x 6 or similar as the base just to help spread the load on the concrete floor(if any). If the floor above is tiled for example you might find small cracks develop if it is left to long, just with day to day use.
