You should keep the rng for the skeleton keys how it is now.
But here's what we should do for those running a big amount of strikes in a row getting unlucky with the drops.
You get a gaurenteed skeleton key after 10 strikes. Heroic strikes and strikes from the siva playlist counts as 1 strike but nightfalls count as 2.
That honestly seems fair. 10 strikes is not too much and not too little. I mean I don't mind doing 5 nightfalls for a skeleton key. It's worth it cause the loot from those chests are usually higher than your gear by at least 3. Plus the artifacts are worth the grind. And for those who think 10 is too much it's really not considering you can level up from everything now. Archons forge. Raid. Trials. Three of coins. Even crucible.
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I get them fairly often. I wish they would buff the drop rate of exotic engram's and have them have a higher chance of giving you something you don't have. I want a telesto. On another note: keys go to the postmaster, if anyone was wondering.