I like physical copies of shows I know I will rewatch. I would keep it if I had the space.

But do you have the space? Do you prefer physical because you say you do and you mention concerns that don't apply to you if you just keep them.

Ultimately only you can answer that. But if you are worried enough to posting this you should probably just keep them imo. Unless you simply cannot store them in which case digital purchases beyond streaming also exist.