But better to put in the real thing and build the sound around it than try to shoe horn it in later IMHO.
I have to say that I often intentionally record a live bass later on in the process
I typically programme a basic drum beat with the groove I want for the track (just kick, snare and hi hats)
I then record the guitar groove, piano/keyboard groove and a guide vocal
At THIS point, when I get a sense of the whole track I will record my BASS line, which naturally grooves with the other elements - i.e. Get a little more "flowery" between vocal phrases and lead into and out of natural transitions
I will then go back to the drum groove and change the kick drum timings to lock in with the bass (I find I can get a better "feel" for the groove playing guitar as I am not a natural drummer)
I don't always work like this but it has ALWAYS been very successful so I just wanted to post to say that you don't always have to record the bass first - I think I even recall that the Beatles often recorded the bass lines later in the process so Paul could compliment the lead vocal with his playing