StubHub and similar services should also guarantee ticket possession within 7 days. If you buy the tickets you get the tickets immediately. It's bullshit that you buy the tickets but don't receive them for weeks or months. That's too big of a window to let sellers change their mind.
I bought tickets through SeatGeek via BigTicket for on November, 19th for a January 7th show (tonight!). I wasn't told at time of purchase that my tickets would not be delivered until after January 1st. In fact I wasn't told until I e-mailed customer support and asked where the hell my e-mail delivery tickets were. I expect e-mail delivery to be instantaneous. Not 7 weeks later and 6 days before showtime.
What if the Lakers ticket seller had until the final week to deliver tickets? If they're expensive today they'll be even more expensive then!
This is inexcusable and StubHub is fully responsible for the situation. They do not get to shift blame to the seller.