Roadblock!

So I told you last time I had completed 20k words of my mg novel.  I showed it to my new critique group (two wonderful women and extraordinary writers) to read from the beginning for the first time.  They liked my story a lot, and gave me some insightful feedback that really made sense to me.  Part of their suggestions involved tightening up the timeline and changing (somewhat) the personality of one of the main characters.  In other words, there were some major revisions to be done.  So I have a dilemma.  Do I push on and complete the last 10k words or so to finish the rough draft using a timeline and character that I know will be changed significantly, or do I stop moving ahead and start revising what I've got so far?  This roadblock had me stuck, not writing anything, for days.  What would you suggest in this situation, and have you ever been in this situation yourself?