It's an insane crutch to newer users that is very appreciated by them (and yourself more than likely if this was as thing when you were new.) How many times did you just fall over trying to learn the game and play? Hundreds? Thousands? Useful tool that anyone can use if you choose. I know I would be grateful if this was a thing back then. I agree that it would take longer for new people to learn; always relying on the tool to help them. But to say this will "kill" replay making seems like a stretch. Replay making has always been the coolest and most creative thing in Toribash and something that goes hand in hand with it is video making. If there is enough of a demand and drive to do it, people will do it, even if it's just for e-peen.
I honestly believe the problem is of a different aspect. The "I didn't have this when I was new, so why should they?" type of attitude that most older players hold. It's understandable, but everyone should just be happy for the newer players. If people are worried about replay making becoming a thing of the past, revitalize it, have veterans teach. The community is self driven in these sorts of things, it's all in your control.
Another opinion I have is that some people just play multiplayer, and that's fine. A lot of people just don't branch out into the aspect of replay making or sparring and they'd rather focus on getting items for customization. People want results: If a tool is going to do that for mods like boxshu, where if you get a good strike and multi DM the second turn, you'll win. More wins means more TC and being consistent in winning is where they rely on the tool. I think that's completely fine. If people do get interested in sparring or making replays, I already think that's the first step in knowing that they'll need to not use move memory. People need that interest in sparring/replay making in the first place in order for them to not rely on move memory, other than them not wanting to use it because of their personal drive.