Before starting the new year 2014, Google John Muller responded to a question in the Google Webmaster Help forums about changing a site’s URL structure completely.
MattAshby from Webmaster Forum asked “Advice on URL structure before we get burnt again” on its own site www.rightboat.com that is it a good idea to change the dynamic URl’s To static URl’s.
The site has tons and tons of dynamic URLs that look like this:
Then John Muller Replied on it that:
Getting back to your question about the URLs … I’d recommend *not* changing them, if you’d just change them for SEO reasons.
We’d need to recrawl & reindex your whole website, and afterwards we’d be able to understand it less than before, so in short: there’s no advantage to making that change on your website.