The only way to increase traffic is with quality content. Google linking to your site is pretty irrelevant unless:
1 - you have unique content
and/or
2 - you have alot of people linking to your page
Worrying about Google indexing everything is too simple...
1 - make your page titles unique
2 - put your page heading in an heading tag
3 - don't muck up your site with poorly thought out code
WordPress, out of the box, does all of the these things.
So, in a nutshell, create good content and join the communities that make sense...let others know you are out there. Google will do its part if you do yours.