The single vine should keep growing longer and producing more flower clusters. And with only a single vine, it will grow very long, very quickly. I would much prefer to grow several vines, have a bushier, shorter plant, and use more square feet of soil space.
I once grew Early Girls on a trellis, leaving 3 vines per plant and removing all suckers. They reached the top of my 8-foot trellis and I cut them off there hoping to ripen off the green tomatoes lower down. The plants were left with no growing tips and then did something that completely astounded me. They sprouted more tips right out of the topmost leaves. Not from the vines, not from the stems, but right out of the leafy surface of those leaves. I wouldn't have believed it if I hadn't seen it myself.

Thanks tctoehr. I should have mentioned that I topped them off once they got higher than I could reach. So unless I can bank on sprouting from the leaf like you did (that is really amazing. hope you tookk pictures) I will just let the new suckers grow. Normally where I live (Sacramento) is ideal for tomatoes but we had a really mild summer here and the weather now is looking like fall so I will just let 'em go. thanks again.