The kind of music that is fundamentally made with electric guitars & basses, had all of its major stylistic developments over the span of about 30 years.
Every development that followed, was essentially happening in subgenres of those primary, defining styles.
That era ended at least 15 years ago.
So, looked at in those terms, it's an incredibly short window to establish a truly classic brand, or even instrument.
For sure, there are many great brands, and instruments offering refinements of established classics (much like those musical subgenres, refining, and hybridizing the established classics), but until primarily guitar based music becomes the prevailing mainstream style again, I think it's going to prove very difficult to launch a new brand, or a radical new instrument that can truly be considered a classic - in many ways that ship has sailed, and I don't really see much appetite for a retro revolution (thank goodness).
I don't doubt that there will be new, bold, exciting developments, along with highly regarded refinements - but it's a pretty niche concern nowadays, compared to what it once was, and even if we were to have another "Grunge" moment, that lasted a decade, that's a tiny window of opportunity to establish something that can be truly considered a classic, that can go toe to toe with the Fender Precision, the Fender Jazz, the Rickenbacker 4001, The Music Man StingRay, Gibson, Wal, and a handful of others.