I visit this forum just about every day, so I'd probably watch an entire tour online. Allow me to explain:
There is a virtual concert experience in development that brings a forum like this into the 3D space of a live concert. Imagine if we gathered every day in a virtual representation of the venue where DT played, we could interact with each other and walk around this rendered space via an avatar -- the show would start and on the stage transforms into a live feed of the band (not a digital representation, but the actual band captured on a 360 camera). We can walk around the venue and experience the show from different angles - talk to each other like we do here.
More importantly, its a community of fans just like this forum. I've always wanted to watch DT at Wembley Arena and this technology creates that experience in a virtual setting, but the performance is streamed into the forum in real time as a video feed.
I think its a cool idea that enhances what Rumby proposed. The technology exists and works now, but it needs some continued development. At some point it would be great to bring this to DT management to see if they might embrace it because it seems ideal for this fan base.
Of course, a rotating setlist wouldn't hurt either.