"Bit Connor"
I believe that it's wrong to use a license to try to enforce such cooperation. Look what happened with KHTML when Apple started using it for their Safari web browser.
I haven't followed this in detail, but I think that, even when a company is reluctant to cooporate, it is better to have their code available than not. Also, using the LGPL rather than BSD is a clear signal that contributions are expected for the library, BSD condones making proprietary forks.
The FSF advises only to use LGPL in rare cases as a tactic to ensure greater freedom further down the line.
They advise to use GPL instead, as a crowbar to force any applications using the library to be GPL as well. -k -- If I haven't seen further, it is by standing in the footprints of giants