Here are 5 possible reasons:  

WordPad less appealing to users who need a powerful word processor for their work.   

WordPad is not as user-friendly as other word processors.    

WordPad is not as secure as other word processors. 

WordPad is not as compatible with other Microsoft products.   

WordPad is not actively developed as other word processors.     

These are just some of the reasons why Microsoft might consider removing WordPad in the future.