Should Open Source Communities Avoid Contributor Agreements? (ComputerWorld)

[[ What about mandatory copyright assignment required by Free Software Foundation for certain projects? ]]

Well, GDC, the D compiler which use GCC as a backend, cannot become a part of GCC because even though the D frontend is opensource, its copyright isn't assigned to the FSF.
This nearly killed the project and hinder greatly the distribution of this project in Linux distributions..
I think that the FSF reasons for this mandatory copyright assignment are really specious:
1) as seen by successful lawsuit made by projects which doesn't use mandatory copyright assignment, it's not needed for lawsuits (even though it probably help)
2) if the FSF wants to relicense some code in an incompatible manner, they would loose the functionnality provided, so *what*?
We're talking about a frontend for one language, not something which is a core part of GCC..