When you realllly think about it (mind you its just a theory), its perfect, dish could throw all HD on the new bird (so voom etc, arent mirrored on 2 sats) + move espn etc from 110, have all HD on one sat, and use 129 and 61.5 for hd lil, freeing up enough space for 15-20 more hd chans on each bird (currently, figuring taking off the voom, discovery etc)
Though it wouldnt happen for quite a while, would need to migrate all customers etc, if they started installin the new dishes now, in 24 months (at most), they can cut everyone off "call dish for a free upgrade, just give us your soul", and all HD will be on one satellite, which is viewable from near everywhere (though it is lower in power)
Just a crazy theory