To me, one of the very interesting things about Battletech is that the average tech level and average lifestyle of the average people in Battletech is very contemporaneous to the time in which it was created; most of Battletech is basically the mid 80's to early 90's with stompy robits and a few gadgets here and there to make it feel like what the 80's thought the turn of the century would feel like. To me, this is awesome, or as a friend describes Battletech "metal af."
However, this is also a problem--the problem is that, in my opinion, Battletech has hung onto this for too long. Battletech is now stuck in "perma 80s" and unlike say, Shadowrun, where most of it still seems "feasibly futuristic" a lot of Battletech (the parts that aren't necessarily supposed to) seems laughably backwards. Nor does it have the "dial it to 11" factor of 40k, where stuff is very intentionally retro-techy. One of Battletech's selling points thematically was its "near contemporary" vibe--but now Battletech has fallen behind the times. As I mentioned Shadowrun, even it has been "upgraded" to be more of a future to modern tech (the addition of wireless, etc)
Should there be new content and a new time leap, I also think it's time for Battletech to appeal to a new generation (as a proper generation has passed since its conception). Similar to how Battletech largely visualized "What would a generation from now (with stompy robits) look like?" that should be the same approach that's taken now.
This is also the reason Dark Age bombed so hard in my opinion--rather than understanding that Battletech was originally a largely contemporaneous universe, the designers made the mistake that it was "retro" (because around 2000 it was starting to be very retro), and tried to go all out 40k retro. For Battletech, that just doesn't work. Familiarity and stompy robits work. "Almost real" is its niche (at least until you start digging further into FASAnomics than you should...).
Perhaps in 3250 (or whatever is next), with the Clans having been around long enough and Comstar being somewhat less busy bodies than they were before (or so they want you to think?), a period of relative economic and technological growth hits the Inner Sphere, and the majority of it undergoes heavy micronization to bring it up to "modern" terms, and maybe they've got just a bit more of what we're just starting to play around with now--quantum computing, gene editing, some cybernetics, daily life AI (think moderately improved Siri, Alexa, Google, no singularity), to name a few.
Along with a completely new (and actually balanced) set of weapons, etc within the existing play rules, largely simplified from the giant mess we have now, I think this would go a long way towards giving Battletech some modern appeal. I know the 80s/early 90s vibe is a n o s t a l g i c a e s t h e t i c one for a lot of us, but us grogs can always go play in our 3025, 3050 etc sandboxes. There's nothing wrong with having something "new."