sai is fr from the only company still running a 32 bit version on a 64 bit operating system
That pool is getting less and less and given that running a 32 bit program on a 64 bit OS consumers twice as much minimum resources as it would on a 32 bit machine and it still only "sees" a small portion of all potential resources available to it, it's no bueno. Bare in mind too there are no more fully 32bit builds for Windows anymore. Now, the 64 bit versions still have 32bit libs, but they won't be lasting forever. At some point, it will be left up to 3rd parties to have projects that put those libs back in (like one for 16bit libs on a 64 bit Win install).
Really, we have heard the death knell of traditionally licensed software as it is, may as well go fully browser based as it is (and most on here know that I am no fan of the subscription based service). With WASM (native compiled code, I use C++, but just about any compiled code can target this), WebGL able to have damn close native performance.
(now it might just be that developing a 64 bit version is damn expensive)
No, it's not really. If I can go in and run a Qt/C++ app and have it deploy on all 3 major platforms and have it target 32bit
and 64 bit with the only difference being the gcc compiler, no, it's not that expensive. And I'm saying that having done projects with just myself doing everything. Given what they charge and the niche industry that they target that's willing to pay that target price, even the cost of the Qt license should be easily made up for and they would actually be able to increase their target audience without having to maintain more then 1 codebase (this is the same framework that is used for Maya and how they are able to target all 3 major desktop platforms). Now, I will say this, it will have a cost to port it to that new framework, but after that, the burden will be eased. At some point they will have to bite the bullet and if they want to do something like AutoCAD did and have their program on the web, have to port it there as well (they at least won't have to deal with the Qt framework then though, so there is that plus).