Building several versions and putting them up to download is a bit like a "double sided knife", you're avoiding possible damages by downloading binaries from untrusted sources, without verifying its authenticity, but you're also making people delay temporarily (or possibly permanently) updating to current, up to date versions with bug fixes, new functionality and stability improvements.
I was only considering doing some 0.92 builds for offline signing. It's the last version with x86 support and can sign for 0.93-4-5.
0.91 is a goner, there is just no way someone could get that online on consumer hardware. It was already locking up for most users around block #240k.
As for updating, people will have to if they want to use the segwit and BIP32 wallets (when that comes =P)