[consulting] Feasibility

[Steve Yelvington]

Having been through a ton of news and community site upgrade/migrations 
going all the way back to our first use of Drupal 4.5 in 2005, I can say 
this:

1. It depends.
2. Core tends to be easy.
3. Contrib can be highly unpredictable.
4. There usually are better ways to do X, Y or Z than the way you did it 
in the earlier site.

#3 and especially #4 have led us toward a pattern of "build clean, then 
port the data" rather than running update.php and hoping for success.