NBC has been on sale for a while now as GE has a leadership quote that it lives by..."rank #1 or #2 or fix it or sell it". NBC was a fixer and it didn't happen. so GE is selling it.
this is a joint merge, not a complete buy out. the two are merging and comcast gets 51% which is control of the new company. GE gets a failing business a start on it's way out of its portfolio and a good start for NBC instead of just dumping them. from GE's and NBC's sides, this is GREAT news. as for the comcast side and the customer's side, well, all of your posts above say it all.
but good move GE.