Flow is a very good and powerful widget. I went through their discussions and FAQ's and found that the server script to move LQT to Flow still needs to be developed.(or is it already developed?) This will pose a major issue of porting the old data if the script does not come up any time soon. Based upon the discussions that are present, there are many organization using LQT and are less keen on shifting to new widget. And even if they are to move to Flow, the script is a necessity.
You as well might have thought about this issue.Another naive solution will be to adopt Flow on testing basis for wikieducator. Users will use this and based upon their feedback, changes in Flow widget can be made accordingly(this is another project in itself). It will as well help the developers.