WASHINGTON — If the Walt Disney Co. reaches a deal to acquire most of the assets of 21st Century Fox, it’s likely that both companies will minimize any antitrust issues, describe how just how necessary the deal is in a fast-changing media universe and point out the many bulked-up new competitors there are in the content universe.

It may all be true, but the Department of Justice’s lawsuit challenging AT&T’s proposed merger with Time Warner has disrupted notions of what will get the green light from antitrust regulators. That’s not to say that a Disney-Fox deal is similar in structure to the AT&T-Time Warner transaction, but there’s a certain hubris now in envisioning any major transaction as a sure thing.

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