Back in 1998 when I was mkting vp of Activeworlds, precursor to Second Life, I met with all of the major film studios, who told me to come back when AW looked and felt like the Holodeck...seems we may be getting there with sufficient compute power, but bandwidth will indeed be the holdup. Unless everyone get's ftth (fibre-2-the-home), it won't work. Wireless won't cut it...not wimax, not LTE...no friggin way; not unless the FCC frees up 100's of additional Mhz...and even then...may not be sufficient.