Between dosbox, xp mode, and virtualbox/vmware, there isn't any point in getting a 32bit operating system for compatibility anymore. How many 16-bit executables do you run on a daily basis anyway? Since the late 90s I've probably only run one, a copy of Sim Tower which I played a couple times in 2005.
I've installed plenty of 32-bit programs on my computer without a problem. In fact, the majority of my programs are 32-bit. This is probably the case for most people - if you go in your program files (x86) folder you'll probably see that it's a lot bigger than your program files folder. The only issue I've ever had with compatibility is installing a wifi driver on my mom's computer for a really old usb antenna. We just went out and bought a new antenna for like $20 and it's been working fine ever since.