Why would it fail? I see no reason. I have a simple stereo amp with 2 LS50s I don't see anything failing soon. My gear has an easy life, playing 89dB the lodest. If the stereo amp goes, getting another neutral Yamaha shouldn't require EQ, no? But I would first try to fix it anyway. I don't see in these conditins why would my tweeter ever fail, but getting another LS50 wouldn't require new EQ, right?
Most of my files are on my NAS. If that goes, again, I won't need to do EQ with the new one. I said numerous times here, I don't sawp gear, I don't go for upgrades, I don't change just out of curiosity, I'm not in it for the gear. I'm trying to reach the "set&forget" point and I'm almost there. When I EQ my KEFs, the market can forget about me as I will forget about it.
Honestly, I couldn't be happier with what I got. Years go by, but still when I fire it up... Man!!! Just last night I put some good Chemical Brothers tunes through my new headphones... I was blown away. Same goes for the speakers; I played Different Corner by George Michael the other day. It's just heavenly.
Holding onto the REQ gear just because in 10 years time my amp might die... And honestly I don't even see her dying. I bet she's playing 4watts most of the time and it's a walk in the park to deliver whatever little LS50s ask when they dip under 3.6 ohms (even for 90dB SPL).
I just don't see it.