Group members want to work using virtual meeting (google hangouts) but we already have bad group dynamics
I know this answer comes too late for you. 

But I agree with your assessment. This group project is only going to sink from here. To which, I would build on one existing comment already offered to you. 


  Raise your concerns to them, and then listen to what they have to say
  with an open mind? 


That being said, do not raise your concern to them as a group, raise your concerns and listen to each what has to say with an open mind, but do it individually first. If you bring this concern to them as a group, most members of your group will probably just make the most expedient decision that takes the least amount of commitment on their part, a vote will be quickly called, and then that will be the end of it. 

Also, I agree that the Professor wouldn't want to be bothered with such a problem. Learning to work with unmotivated colleagues is a fact of life. This is your problem to solve, not his.