I am curious to see if he will return… but I think people mistake their place in all of this, and it is a persona I have used in a number of cases.
Q dons the atmosphere of supremmacy. He asks the questions. We ponder the answers. It is the no-nonsense sensei who you follow because you want to stand as an equal or to try and understand. He is simply doing his thing, and we will either sink or swim. It is of little difference to him.
There are a few moments where this breaks to give a bit of encouragement or remediation - but Q has the amswers we are seeking, or has at least done a damned good job of giving that impression. He is showing us how to get where he is, but is not doing it for friendship or comraderie per se.
For me, I teach people because ignorance is a disgrace and I love to see people stand at the summit of their own climb before locating yet another one to scale. If they are attached to me at the end, I have bred dependency.
Keep an eye out for Q, to be sure - but I think it defeats the purpose of Q if we sit around and wait for Q. He's not our 'friend' in a classic sense of how society thinks of it. He is closer to the boot camp instructors who give you lessons you'll remember forever, but you'll never see again in your life. Petty Officer White isn't going to come back and give me Marlinespike lessons, again. But I will always remember the difference between a line and a rope, and appreciate the role he played in my life - minor as it may have been.