So here's the bottom line: being in many prior editions is still not, in itself, enough of a reason to include that class in 5e. It helps to have been in many editions. It adds something to the argument that something should be in 5e. But it's not sufficient, in itself, to say it must be included. Because if it were, you'd see the same sort of passion concerning a Shaman class. Or a Witch class. Or a Wu-Jen class. Or Ninja class. Or even, God forbid, a Jester class. All classes which have appeared in many editions, which are not in 5e, and which don't seem to have much push to be included in 5e now.
So you're going to have to do better than "It's been in three editions" for a Non-core class.