The problem is that I've lost faith in SRAM reliability. I used to work in a shop and I am a mech engineer by trade. I have taken apart the parts that have failed on me and noticed two things: SRAM design philosophy is geared toward weight savings and keeping costs low, not reliability. This is evident in their rather extreme machining of critical components and material choices. ( take apart a sram shifter and you'll see what I mean ). Nothing wrong with this philiosophy, it's just a tradeoff between reliability and cost/performance. SRAM lever design is also rather crash sensitive, and as I race, I can't afford that. ( the chances you will NOT be riding on after a crash on sram levers, again due to their design, is significantly higher than that of either campy or shimano). I was willing to put up with it's defeciencies for awile... but this is the third time sram is failing on me race week and I highly doubt I'll be going back.
SRAM is not significantly cheaper than either the big S or campy- and I see no point in buying a NOS 10 s force/red shifter when I would eventually upgrade to 11 anyway. so why not go 11 straightaway?
I've gutted shifters for use in 1 by drivetrains. I've put the red shift mechanism (from shifters with broken shift bodies or brake levers post crash) into rival/apex levers as an upgrade. All multiple times for myself and friends. I'm very familiar with what every piece inside all levels of their shifters are. Apex and Rival are cheap. Force and Red aren't.
By all means go ahead and swap if that's what you want to do. I just find it silly that you admit you like the shift feel and function of SRAM but would change due to failures of parts that are known to fail without trying models they offer which don't have a similar issue.
As an aside, I've crashed on Red levers and damaged individual components. I've been able to buy them and rebuilt shifters (shift body was $25). Try getting hold of individual components for a Shimano shifter AND being able to rebuild them yourself.