Without the controversy caused by Page and others, the Blues greats would most likely still be unheard of. They would have no recognition, no fame, no money. Nothing. I've always found it interesting that it was the British bands who took the great Blues masters to another level while American bands stagnated. Bands like LZ and The Animals did more for those great artists than any American artist or company ever did. They shouldn't be demonized for what they did, they should be applauded and thanked.
I heard John Lee Hooker, BB King, Muddy Waters, Howlin' Wolf, and Robert Johnson years before I heard Led Zeppelin.
I think Led Zeppelin stole or "borrowed" from more people than any other band in history.