I don't know what is going to happen, but here is my plan of action.
I've only had VOOM for a month and loved it. I had Dish (customer for eight years) and kept it for the 508 DVR (SD DVR which I own) and had planned to dump Dish as soon as the VOOM DVR was available. I've not watched any Dish for the past month except for the few things that automatically record on the DVR.
My plan is to wait until May to see what happens and if no VOOM or "new voom" I'll then switch to COX (already have internet and phone service with them) because they have, basically, same HD as Dish plus a HD DVR for lease and no commitment. I'll dump Dish in May when COX is installed.
Even if Dish picks up VOOM 21 I'll stick with COX for a while because, from what I understand, Dish's new 942 HD DVR isn't available for lease to their old customers only new ones... how rude and dumb is that. So, unless something spectacular happens at Dish in next year I'll be a COX customer until something better appears.