Sure if you can re-rip stuff. I was hoping to avoid that step.
Keep in mind, however, that you only need to re-rip the albums where songs don't have silence between them, which may only be a small percentage of your library. Also, if you've been using MC to rip your albums, you'll find that MC has been using a version of the LAME encoder that contains the gapless metadata for quite a while now. I checked some of my older rips, and the MC file info indicates that even these older files contain the metadata.
Even if you do have to re-rip, I find that if you just do an album here and an album there, it gets done faster than you'd think.
Larry