With respect to Craig's 'Flow', I have been thinking about the 
inertia caused by the perceived need to make major system changes 
backward compatible.

I used to think that my current situation in life has been determined 
as a result of the sum total of past events and I was sorta stuck 
with what had gone before. Now, I prefer to think of my present as 
being determined by my desired future. Get a clear picture in mind of 
the desired future and today's decisions become much easier, being 
made towards achieving the desired future.
At each decision point, the decision can be made towards improving 
the quality of that future picture by bringing it into clearer focus.

 From this point of view, I think it may be best to get a clear view 
of the future of Squeak, then do today what is necessary to create 
that picture without worrying about the backward compatibility. Those 
that need to and want to, will do the required changes to also 
partake in that desired future, those that don't can remain with 
whatever works for them. The backwards compatibility issues I believe 
could most appropriately be dealt with by those parts of the system 
that have the issues, thereby reducing the inertia for going forward.

In the past, if this way of thinking would have been in vogue, we 
would most likely already be running with Craig's 'Flow' in the 
system. I'm assuming from other opinions that would be a good thing...

The desired future of Squeak determines what we do today, as opposed 
to what was done in the past...
Of course.

Mark Twain evidently wrote: "Twenty years from now you will be more
disappointed by the things you didn't do than the ones you did."

Ken G. Brown