We will, most probably, also implement a third party framework for front-end that will totally change the way you make templates and css. It will make this job very-very easy. More about this in the future.
If we incorporate the CSS framework in Elxis core then after update, current Elxis users will have a "problem", as existing templates will not render as expected.My opinion is that we shouldn't do that.We have to offer an alternative (and advanced) way to design templates while keeping the backward compatibility to those that need the old way or they do not want to change.We are currently testing all options. Be sure that we will select the best one.