Who do you mean with "gamers"? No one but a few hardcore FF/JRPG fans thinks so. Not only from my personal anecdotes, but also from many series outsiders and more mainstream gamers do you hear "This will be my first FF! I've always found the battle-system in FFs boring before." in comments under FFXV videos and articles. Do you really think young, modern gamers see FFXV and think "Man, what a shame I can't click through menus first to make my character attack instead of pressing a button while I move and dodge in real-time - this is so unexciting, pre-order cancelled!"?
But besides, what "constant focus on non-menu based battle-systems" do you mean, anyway? The whole FFXIII-saga was menu-based. It just streamlined a lot of the typical ATB busywork, that doesn't actually add any depth or strategy, and shifted focus to macro-managing "roles" in battles. In normal battles it was as button-mashy and in boss battles it was as involving as older FFs. Even LR, FFXIV and FFVIIR (from the looks of it at least), where you can move around in battles, are still menu- and ATB-based (waiting for bars to fill up), but instead of navigating through menus you switch through custom sets of spells and press designated buttons to activate the corresponding spell. Ultimately it's still an abstraction of combating, whether you scroll through menus and choose a command or directly press buttons that relate to certain slots in your sets, which are just a visualization of a "slice" of a menu if you think about it. How is that less strategic or "deep" to you? Honest question, I'm curious.
The only non-menu-based FF so far is FFXV and you have to wait until it's released and the sale numbers and reviews are out before we can judge whether the change of battle-system did alienate enough people to have any impact on its success.