Since Windows Server 2008 R2, WoW64 is an optional feature which can be uninstalled. It means that it is possible to have 64-bit only server, that cannot execute 32-bit code. I'm trying to think about any possible benefit from disabling/uninstalling WoW64, apart from the two obvious ones: savings of disk space and lesser "attack surface" for malware (most is 32-bit), and I don't see any, while the drawback is huge: no 32-bit code is able to run there.
My question:
Is there anywhere any meaningful statistics/reports or at least anecdotal evidence that says how many "64-bit only" servers are out there, used in production? Is it time to start building 64-bit versions of software even if there is no benefit for the software itself being 64-bit just so it can run on these 64-bit only servers?
Clarification: My software is a network bandwidth monitor which is used mainly on PCs, not servers, but some do use it on servers. It is hard to get any meaningful data from my clients on this subject since it's many clients that buy 1 copy and not few that buy a site license.