I think Eclipse is overly ambitious to say the least. Any of these " private jet transportation for the common man" plans never materialize because they're always proposed by people in general aviation, who think like aviators, and don't take into account that the vast majority of the public perceives anything smaller than a 737 as being unsafe.
The VLJ concept will not radically change air taxi or fractional operations. Performance wise it's like any 25 year old Citation, just with less fuel burn and a warranty.
The Mustang will probably carve out a TBM-700 like market, for the owner pilots who want 2 engines and a jet. Those who want cabin size will stick to King Airs and PC-12's.