Surely it is application developers rather than distributors who would support this thing?
In the Gentoo case, presumably I'd merely have to remember to pick a kernel option before emerging something that could use this. Said option would be mentioned in the middle of a 300 package emerge, after setting a USE flag, which I'd never notice 8)
For now fixing how CUPS can cause a 2 hour load time for a Libre Office file is probably going to yield better performance improvements (its something to do with printers being unavailable away from "home")
I am not an expert but this look like a bodge of some sort. An application is written to work with a 2^n bit system. If it runs on a 2^n bit system then great. If not then you'll need a compatibility layer.
Surely the 64 bit version of a (previously) 32 bit app can be efficient in terms of memory and register usage.
I can't help but be reminded of the 16 -> 32 bit migration.
FIX THE BLOODY APPLICATION!
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