i had to take out about 3 feet of machine quilting one time from a king size quilt, it took about 6 hours and was a mess...but i got it done and re-quilted it...so,
totally up to you, if you want to take out what has been done get a new sharp seam ripper and go to town, it will take a while. then you have to clean it up and start over. is it really so bad? maybe once you finish the binding and wash it it will be great? those two final steps really can make a quilt sing !