How to Fix ADCs?

In the perfect world of LoL...

Tanks beat Mages. (Tankiness beats burst)

Marksmen beat Tanks. (Sustained damage beats tankiness)

Mages beat Marksmen. (AP Burst beats sustained damage)

Assassins beat Marksmen. (AD Burst beats sustained damage)

But the boards have noted some interesting issues with marksmen.

1. They deal so much damage so fast it's pretty much burst.

2. Their sustain is high enough for them to "facetank sustain" assassins and mages that can't kill them fast enough.

These are the main issues here because this combination of features allow them to beat both tanks and mages. Their damage is high enough for their burst to be on part with mages' burst but their lifesteal give them a bigger advantage over a mage because their damage come from autoattacks instead of abilities, and they can heal off their damage so they can outlast mages. Mages still have the edge in general reach and utility, so they still have a place in the meta.

However all the items given to marksmen to help defend them against their natural predators seem unneeded now because of their super high damage and sustain. However now that their damage is so high these items feel like overkill.

So, to make marksmen more like dps damage dealers, we would need to hit one of several things.

1. Their crit damage.

2. Their sustain.

3. Their safety.

4. Their great synergy with damage masteries

Personally I would hit their lifesteal a tad and give ranged champs as a whole a lesser benefit from certain masteries. This way their "false" health obtained from lifesteal is lower overall, making them weaker against burst.

What about you guys?