By adding so many features to the WSL experience that (at least for their intended use case) using native Linux is such as strap ball that it falls into disuse
Microsoft making a good WSL will not change the Linux you have right now. Fearing that the Linux you have right now will "fall into disuse" means fearing that you will stop using it and you can choose to continue using it no matter what Microsoft does.
A less charitable read of your position is that Microsoft will tempt other people away and they will no longer give you cost-free updates. Of course you don't mean that.
