Can they make it *not* a great place to develop 32-bit apps? Can we just make 32-bit apps *not a thing* any more? Yeah, yeah, some customers are going to whine and whine and whine...
Two things:
1) I can now get a Raspberry freaking Pi with 8GB of memory, and who, seriously, is still running 32-bit Windows, right now, today, that needs cutting-edge OS and library support? Even if you don't need more than 4GB of memory (really, 3.5GB in practical terms, given how x86 memory addressing works) where are these 32-bit CPUs coming from? Atoms from 2011? Core Duos from 2006? This is all stuff that Windows 10 is going to have a moderately hard time running on regardless. Desktop Windows should have gone 64-bit only a release or two after Windows Server did in 2012, Windows 10 32-bit is an abomination and doing away with it, at this point, would count as a mercy killing.
2) Five gets you ten that these are the same people still maintaining COBOL code on their AS/400 systems, because blah blah legacy codebase whatever. Fine, use a legacy compiler for your legacy code on your legacy OS. Legacy! Unless you are talking about Legacy of Kain I'm really not interested... and I have a perfectly good Xbox with a 32-bit x86 CPU for that still, so, you know what? Forget it. It is right and correct that development environments drop support for Tinkertoy-based architectures, we are living in the future like it or not.