Actually that's more what your phrasing of the question is doing, painting a skewed outcome unrealistic of this game in order to reflect the outcome you want to see. Let's just be honest about it. No reason to hide that.
EDIT: Actually, never mind. You're right, it's important that we use unrealistic extremes that no one is actually asking for in order to understand what players want and to what lengths, so I propose we add a 5th question:
5. Would you stop playing healer if every healer had no DPS buttons at all and were provided a trust AI to complete MSQ instance battles (all content otherwise remains the same, outgoing damage included). In order to complete any quests that ask you defeat an enemy, you'll need to join a party with at least 1 tank or DPS, or switch to a tank or DPS job.