Blue Orange
Gone to Texas
There was actually a doctor class in a really, really old issue of Dragon. You could make them better at healing than clerics but with worse combat ability.
Given the popularity of the elf class in BECMI D&D and the elven fighter/mage in 1e and 2e, and the swordmage in 4e, I think 'gish' is a clear area that could be filled and there is demand for. A lot of the other combos of the four major classes are filled in some sense--fighter/rogue (monk), fighter/cleric (paladin), cleric/mage (druid). You could even make an argument for bard as cleric/rogue as it plays support and trickery roles. I think the thing with fighter and mage is they're the two with the most offensive power and balance is an issue.
Given the popularity of the elf class in BECMI D&D and the elven fighter/mage in 1e and 2e, and the swordmage in 4e, I think 'gish' is a clear area that could be filled and there is demand for. A lot of the other combos of the four major classes are filled in some sense--fighter/rogue (monk), fighter/cleric (paladin), cleric/mage (druid). You could even make an argument for bard as cleric/rogue as it plays support and trickery roles. I think the thing with fighter and mage is they're the two with the most offensive power and balance is an issue.