I think there are some benefits in building decks that don't rely on MM to either protect their own cards/threats/Disrupts or to combat opposing MM.
This list below (Top4 in a 23 players sanctioned events a couple of weeks ago) is interesting in that regard. I was on UWMentor/Remora myself and I lost badly against it. Too often I found myself playing around opposing MM that never existed! (
My deck here with 3 Misstep). It must also be noted that historically this event has be swamped by MUD decks, so there was most certainly some smart metagaming as well in cutting MM altogether.
3-4) James 'Jimbo' Dowling - UW landstill
4 Wasteland
4 Mishra's Factory
4 Flooded Strand
1 Underground Sea
3 Tundra
2 Island
1 Polluted Delta
1 Scalding Tarn
1 Plains
1 Strip Mine
1 Library of Alexandria
1 Mox Sapphire
1 Black Lotus
2 Steel Sabotage
4 Mana Drain
4 Force of Will
2 Spell Snare
2 Mindbreak Trap
1 Flusterstorm
1 Spell Pierce
3 Swords to Plowshares
2 Stony Silence
1 Meddling Mage
3 Standstill
3 Jace, the Mind Sculptor
2 Crucible of Worlds
1 Ancestral Recall
1 Treasure Cruise
1 Dig Through Time
1 Tamiyo the Moon Sage
1 Snapcaster Mage
Sideboard:
3 Disenchant
3 Containment Priest
1 Engineered Plague
2 Supreme Verdict
1 Notion Thief
2 Kataki, War's Wage
1 Swords to plowshares
2 Rest in Peace