Yep, it is always possible that WordPress will change something in a newer version of WordPress and if a plugin or theme is not updating their code to adjust to those new changes in WordPress then that plugin or theme could all of a sudden stop working correctly.
I looked at the code in the WP No Category Base plugin and it is simply getting the internal $wp_rewrite global and get_option('category_base') option and then doing an internal rewrite/redirect with the Category Base. You can do the same thing with htaccess code.
Personally I do not think you have anything to worry about with WordPress changing the way they do their Internal Rewriting. It is set in stone and will probably never change. In other words, the WP No Category Base plugin will work forever without breaking. 
If you want to create the htaccess rewrite/redirect rules/code then what you will need to do is get the URL’s before they are being rewritten/redirected and then the get the final rewrite/redirect URL. After you have that information then you can create your htaccess rewrite/redirect code. See the Reference link below for examples.
Reference: http://forum.ait-pro.com/forums/topic/htaccess-redirect-code-where-do-i-add-redirect-htaccess-code/
Example:
Original URL’s that are not being rewritten/redirected:
example.com/catA/
example.com/catA/somewhere/
Final rewrite/redirect URL’s:
example.com/blah/
example.com/somewhere-else/
redirect everything in catA to the root site URL
RedirectMatch 301 ^/catA$ http://www.example.com/$1
redirect the “old post” to the “new post” and to the new category as well.
RedirectMatch 301 ^/old-category/my-old-post$ http://www.example.com/new-category/my-new-post$1
- This reply was modified 1 day, 13 hours ago by AITpro Admin.
- This reply was modified 1 day, 13 hours ago by AITpro Admin.