Converting a very large site, having sections that are to be gradually phased out, a large bulk of the pages are being done in div's.

But those other pages mentioned, 100+ including many forms, some of which are behind ssl's for user panels, will remain structured with tables.

On these unconverted pages, will "noindex" in the meta help?
They don't presently have it, so should these pages be renamed, with a redirect, and include the noindex?

I'm wondering how devices favoring divs will treat the situation when they happen to encounter "old" pages that are structured with tables.

What to do in this situation.