Over"view"ing the potential of virtual schooling

This past week for one of my class assignments I read a chapter from the book Digital Technologies and Social Media by Scott McLeod and Chris Lehmann.  The chapter was on virtual schooling and it was very eye opening for me.  The statistic that stood out the most was that some predict that virtual schooling will make up half of all k-12 education by 2020 (Christensen, Horn & Johnson, 2008).  It is hard for me to wrap my head around that idea.  2020 is only 7 years away-both of my children will be in high school by then.  What will high school even look like then if this prediction does run true.  Will they even come to a brick and mortar classroom for any of their schooling?  To be honest the thought scares me a little even being a technology teacher.  I know technology is constantly changing education for the better but I guess some of my old school upbringing shows through in that I worry what will happen to all the teachers.  The students will still need teachers but to what capacity/roles will the teachers play in these virtual schools?  What kind of training will the virtual school teachers have?  The chapter from the book does address some of these thoughts but it still has me thinking.....the roles of teachers will definitely be changing-those that do not embrace technology will not be able to stay in the game.