You can't sell these ETFs without incurring capital gains, potentially large. So it isn't really a choice.
Away from large cap stocks to what?
I'm not sure you'll come out ahead. (Personally I don't get the outcry, except for nasdaq which has fairly stupid rules, delaying the inclusion of megacaps won't make the problem go away, but probably increase since the float will be massively larger). It's inherent to being a passive index.