Comment 317 for bug 1

The gap in market share may get worse. 32bit hardware is no longer being sold or manufactured. The 64bit version of Ubuntu doesn't "just work". In fact on large segments of the Ubuntu English Forums people are told to install the 32bit version.
Common complaints about the 64bit version are missing applications, inability to install some applications, and the inability to install 32bit applications as a stop gap measure. Multiarch has stalled in Debain. RPM based distro's are increasingly multiarch. SuSE is completely multiarch.
All the while development of the 32bit version is the main priority of Ubuntu.