Arguably the most important assets obtained in the merger, based on the known business plan, were VX's hubs at SFO & LAX. It's unlikely AS could have gained access to enough gates at either airport to build a similar-sized presence within any reasonable time frame.
And even though gates at DAL are indeed some of the scarcest assets in the U.S. aviation market, they're pretty much irrelevant to anyone apart from WN and maybe DL. The VX "focus city" at DAL was always a joke because they had no prayer of ever being a viable alternative to WN at DAL or AA at DFW. Sure, they served four or five of the largest markets from Love Field, but that's still nowhere near enough to be a carrier of choice for the vast majority of people in the region. The product wasn't sufficiently better than WN for 90% of passengers.
It was even more ridiculous that AA was permitted to cede the DAL gates as a "remedy" for the AA-US merger because the net result was the elimination of two competitors (US & VX) at their largest fortress hub, DFW!
I have flown between DFW and LAX once on VX, and I did like the seatback entertainment system that the VX planes were equipped with. While I am a big fan of WN, the VX product was (at least in my opinion) better than the WN product, and the main factor that made the VX product better than the WN product was VX's seatback entertainment system. However, I have watched streaming television on my laptop or tablet on WN flights using the in-flight wi-fi.
I agree that the DOJ should not have forced AA to give up its 2 gates that it leased at DAL to a carrier approved by the DOJ as a condition of the AA-US merger. The DOJ and the United States District Court for the District of Columbia were both wrong in requiring AA to give up the 2 gates that it leased at DAL. There was already nonstop service to LAX, PHX, ORD, LGA, and PHL from DFW on airlines other than AA or US prior to the AA-US merger, and AA's DFW-MIA nonstop service was in competition with NK's DFW-FLL nonstop service. CLT only had nonstop service from DFW on AA and US prior to the AA-US merger, but WN added DAL-CLT nonstop service in August 2015. DCA only had nonstop service from DFW on AA, but AA's DFW-DCA nonstop service was in competition with UA DFW-IAD nonstop service and NK DFW-BWI nonstop service prior to the AA-US merger. There is still competition on nonstop service between DFW/DAL and the other AA hub markets, and competition would still have existed on these routes if AA wasn't required to give up the gates that it leased at DAL and if AA had resumed service out of DAL after the repeal of the Wright Amendment.
While the VX pullout did eliminate a competitor from DFW, that void had been partially filled in by DL resuming DFW-LAX nonstop service in November 2014. DL has increased nonstop service to LAX from DFW since its resumption in November 2014, and DL now has 4 daily nonstops to LAX from DFW.