I think it'll mostly be pubs and cinemas partaking in such events. You'll get a few enthusiasts at home.
I don't think something can really be mainstream until there is the content. For example with HD a crucial sticking point is having BBC1 through to channel Five in HD. After four years even with HD we're still a month away from BBC1 HD, two years from BBC2 HD and some undefined amount of time away from Channel 4 and Five HD being released from their contracts with sky, find the bandwidth and available to more on some platforms.
I don't think something can really be mainstream until there is the content. For example with HD a crucial sticking point is having BBC1 through to channel Five in HD. After four years even with HD we're still a month away from BBC1 HD, two years from BBC2 HD and some undefined amount of time away from Channel 4 and Five HD being released from their contracts with sky, find the bandwidth and available to more on some platforms.