Subsystems dependency on Blueprint?

[Cristiano Gavião]

Hi,

I had a system that was developed using only Declarative Services. We 
are studying to use Subsystem to help with an isolation issue.

The first problem for us is that it depends on Blueprint and we don't 
like the idea to add this overhead in this environment just to be able 
to use Subsystems.

Could someone explain me this dependency? are beans being injected or 
just services?

would be possible to use DS instead of Blueprint in case no bean being 
injected ?

thanks

Cristiano