I know this has been suggested over the years and that based on the statistics here, which is very narrow in my opinion, there isn't much interest in a Linux version of Quicken (Classic). I disagree… just because it's not discussed much here doesn't mean there isn't interest. That said, I understand the cost associated with porting or re-writing the code for Linux distros. While it's possible to get Quicken running with Wine, it would be nice to have something more accessible for those not that aren't tech savvy. Here's my proposal: Proton.
Proton is a fork of Wine by Valve to allow Windows games to be played on Linux and, so far, it works flawlessly with everything I throw at it. I suspect Quicken is a lot less intensive than a game, so I think using Proton to make a version of Quicken work with Linux is much more feasible cost-wise as well as the amount of manpower needed.