I'm not against a question that results in a variety of different imaginative solutions that can be backed up. I am against a question where the answers cannot be backed up (by either references or logic).
For this particular question I do not believe that Tolkien's writing gives a sufficiently consistent description of elves' attitude to advances to allow an objective answer. I don't mean that as a criticism of his writing, but simply to say that elves were varied, as humans are. So answers may say "elves were very traditionalist based on this reference" or "elves had a thirst for knowledge of materials based on this reference" leading to highly contradictory answers that all give references to Tolkien's work.
In summary, Tolkien's elves lived in a variety of different communities with different attitudes to the world and to technology, so asking how they would react to modern society is like asking how humans would react to modern society.
If the best answer that can be posted is "they would react in a myriad different ways, no more predictable or stereotypical than humans" then I don't see it as a useful question.
I can't see a way of answering the question objectively beyond pasting in a book on human behaviour, so I recommend closing as primarily opinion based.