Hi and welcome to Beoworld ! 
The woofers can be fixed if it's "only" the surround that's falling apart.
This is what we call "foam rot" since it is the butyl foam that deteriorates with age and airs moisture.
I've done many refoam jobs and I'm in Denmark. There are other refoam'ers out there, if you'd let us know
where you are (country will do), maybe we can guide you to one nearer.
Martin