Personally I think department stores are doomed. The original model was brilliant - pull everything into one space and people only have to visit one place - they will also see other things they want and buy.
They were basically proto-Amazon.
Then Amazon et al came along. They can do it faster, cheaper and from a faceless box on the outskirts of Swindon where rent is pennies. With automatic picking they can be run on skeleton crew. All of a sudden the department store model and raison d'etre is aped by something bigger, cheaper and arguably better.
I'm rapidly approaching middle age, I have a stable job and good disposable income. Very few brand loyalties...yet. Basically a department stores wet dream.
I last went into a department store 6 months ago because I spilt pasta down my shirt before a client meeting and needed a new one fast. Other than that they deliver no better service than Amazon at a price premium I don't want to pay and have to travel to achieve. Why would I do that? I also dont shop as a hobby - I have other things to do.
Where does that leave the high Street? Personally I think it's a great time for independents. The only things that get me to town are:
A) specialist shops where I need advice as well as a product and/or sell a selection of products not easily traced or stocked in one place online.
B) places that require my physical presence - eating out, haircuts, tattoos etc.
A department store fulfills none of those. Independent shops often fulfill A) and I am willing to travel distance to visit one.
This is a very unscientific sample of one, but I have a distinct feeling I'm not alone.