1) What could be implications of this? Will we still have internet access?
2) How will it impact Bitcoin?
3) What would be best strategy to prepare for a world with impassible space debris surrounding orbit? Which assets will be a safe haven?
1) Not all internet is based on satellites, so yes we can still have internet access. Vast majority of data is transferred through wires not satellites. Even if it did, we would have much more serious things to worry about than bitcoin.
2) It won't
3) You should ask this in a space related forum like
https://space.stackexchange.com/ to get expert answers not on bitcoin forum.