As i understand it, subspace corridors can be travelled as long as the nodes exist and the coridoor itself is stable. If the corridor is too unstable then it can't be travelled. but the million pound question is what happens to the corridor if one of the node colapses?
I can think of 3 possibilities
1) Without a secure anchor point at both ends, the corridor becomes too unstable to travel
2) THe corridor remains intact, and can be travelled to the exit point. It is just impossible to exit at the collapsed node.
-> D_Sperpentis-Sol Node. The Sol-side node is destroyed. It is still possible to travel into and along to corridor to the Sol end, but Ships can't pass through the doorway to Sol. However, the longer it is unconnected, the more unstable it becomes
3) The corridor detaches from the collapsed node and "flails" around wildly, eventually anchoring itself when as it hits another unconnected node. When "flailing" the corridor remains too unstable to travel.
1) is the most likely the canon answer, based on how we know the knossos works. But that just raises more questions about how the Knossos does it's job - i mean wouldn't it make more sense to have the Gate around the collapsed node? (in this case the Sol-side node)
2) Is possible,
3) Is sheer speculation. Almost nothing in canon to support it, but nothing to completly disprove it. Actually thats an interesting twist for a MOD...Travelling the universe, till you find a corridor that connects to Sol