Xwayland has already been mentioned but this is an important point that not everybody may be familiar with. Xwayland is an Xserver ( actually a specialized version of Xorg itself ) that runs on top of Wayland instead of talking directly to hardware.
If you are running Xwayland, you can run X clients ( x11 software dating back to 2003 for example ) and they will appear on your desktop.
There can obviously be specific considerations around advanced software but moving to Wayland does not mean losing access to software written to target X. Qt and GTK support Wayland and will run native. Applications using other toolkits may still be running over X. As a normal user, you may not even know which applications are still using X and which are not.
This is for regular applications. Moving to Wayland requires a Desktop Environment or Window Manager that supports Wayland. So, GNOME and KDE users are fine but Cinnamon or WindowMaker users would need to switch.