I don't think the internet is killing high end. High end is killing itself.
The internet (thru sites like A'gon) has allowed people to get a taste of high end without having to spend $$$$ at the local store. Once bitten by the "bug", these people will frequent the locals and, all things being equal, would prefer to develop a relationship and purchase from someone nearby.
If high end manufacturers and dealers had any brains, they'd set up a touring system, visit local high schools and colleges and begin introducing younger people to the joy of high quality music reproduction. These are the people that will soon be needed to continue our hobby but, no one seems interested in educating them. Imagine a high school auditorium with Krells, Wilsons and a really good TT playing Eminem, being compared to the same CD on a $400 Best Buy system. Do you think the students would hear the difference? The answer is yes.
Just my 2 cents.