The media have 24 hours to fill on cable TV so they'll talk about anything under the sun.
But traditions, rivalries, travel time and cost and other factors make this a non-starter. The league is better and richer with conferences and rivalries. Let's say 5 years from now Boston and Philly are the best in the East. There's huge money and media exposure to be gained from those teams playing each other many times throughout the year and building for the playoffs. Those games sell more tickets, more merchandise, whip up the fan base and generate more revenue. Much of that is lost when you go to a flat system.
Then there's the increased travel time and cost. NBA schedules are currently determined by:
4 games against the other 4 division opponents, [4×4=16 games]
4 games against 6 (out-of-division) conference opponents, [4×6=24 games]
3 games against the remaining 4 conference teams, [3×4=12 games]
2 games against teams in the opposing conference. [2×15=30 games]
The furthest West team that Boston plays in the Eastern is, what, Indy? The furthest flight is 3 hours to Miami. The majority of their flights are 1.5 hours. When you dump divisions/conferences then your flight time increases dramatically. That means dragging out the number of days in the schedule because you have to build in more flight time - or having more games that are unfair due to travel schedules. It's more costly, more time consuming and harder to schedule.
Finally, most people look at this sort of thing long-term. The top 6 teams in the NBA last year were GSW, CLE, SA, BOS, HOU and TOR. After GSW I'm not seeing that much difference at the top. The West is stronger to be sure from top to bottom but this will pass. Then look down the road a bit and which teams are predicted to be the strongest? It's really a mix - BOS, GSW, MIL, MIN and a whole bunch of maybes in LAL, PHI, PHO and WAS (to name a few). This may not even be an issue in 5 years. Or it could be an issue the other way.
So yeah, the media may talk about this but I think it's a non-starter.