I can easily say they are obsolete. The same way old tech is obsolete. Sure, given a catastrophe, eventually maybe we'll be driving around in easier-to-fix old cars and such, and making communications with whatever simpler analog methods. For the use highlighted, geostationary satellites are absolutely obsolete, unless a catastrophe happens.

Questioning my premise is like saying its perfectly logical to plan your kitchen around eating MRE's because "they aren't obsolete". Today's satellite internet isn't yesterday's satellite internet.