Deep breath guys. GW doesn't give a [big bad swear word]. But the sky isn't falling.
Just do what most of the major GTs are doing. No dataslates/formations, no escalation, no stronghold assault, NO LORDS OF WAR. The frontline guys that just put on the Las Vegas Open (*borat voice* great success!) went further to allow only one ally per army, and changed 2++ re-rollable to a 2++/4++.
I hear the tournies at DTG are modelled after Frontline Gaming events but allow datslates. I would go all the way and ban those too.
That's just my opinion. I've been playing 40k since second edition. But the major GTs have it together, you cannot allow everything. It is just not appropriate at a tournament level.