Do you want mythic difficulty to keep getting supported? Why should blizzard do that when less and less people bother. Lockouts + server only + 20 people only roster + recruiting + running back to each boss + 30 minutes of trash between bosses + food on each pull + needing a warlock for summons + 2 potions per pull, etc. are just making more and more people quit mythic raiding. Why bother with all this bullshit?
At least make it easier for 10-15 man heroic guilds to try the first few bosses and wet their toes. As it stands right now, heroic people simply can't even try mythic due to the barrier to entry and that is a big mistake.