I think it's a great idea. I have had an example of use of mysqldump for myself with all the reasonable switches.

I think you should develop it a bit more. Add more options. For dumping just the structure, just the data, limiting, compressing, generating another command to import.

Also as you can see from the comments here, password box makes people uneasy so better remove it and replace with bold instruction on how to add password near the generated command.

I think you can get decent traffic on this site.