i think i'm going to call the west coast for late june, right after all the UCs get out. april is too soon for people to make plans, and most people seem to be asking for summer cons.
for the most part, i think people who go to both conventions are in the minority; most people will be choosing one anyway, so i think having them a couple months apart is going to build excitement rather than make it more difficult for people to attend.
as far as streaming the con is concerned, YES. in fact, i need to meet justin and co. anyway. i'd love to get multiple cameras on twitch.tv for people to watch; one roving cam doing candids and another focused on the organized presentations.