I just bought a new 64 bit workstation/64 bit Windows OS combo. Even so, I still use all 32 bit Alibre S/W because of the add-ons, which I need. My old 32 bit HP workstation actually ran all the Alibre S/W very well and it did everything I needed. However, I couldn't update the Windows OS anymore on my old 32 bit PC and XP Pro was getting to the end of its effective product life. Lucky for me I made the change, because Alibre has dropped XP Pro now too starting with the upcoming version.
However, just as my 32 bit workstation was overtaken by evolving technology even though it still remained quite useful, there is going to be pressure to evolve all Alibre S/W (including the add-ons) to 64 bits. Yes, they have the capability to run 32 bit S/W now on the 64 bit Windows OS's now and will for some time, but that is going to become a stagnant backwater technologically.
So, to be a player in the future, 64 bit S/W will be effectively be a product requirement in the CAD industry. The need for, and desirability of, software that is 32 bit will diminish significantly (at least in CAD) and it may even become a serious negative. All the 32 bit workstations will end up unused and in the storage closet due to OS development pressure if nothing else. At least, that's my opinion. My guess is that there is a 2 year window left on the 32 bit versions of everything and I may be a little generous with my estimate. In the software industry you either evolve continuously or perish. It's just a hard fact of life.