Earlier quoted context omitted.
It's difficult to say exactly since SEO isn't really an exact science. Some of them will definitely be an improvement. For example, it's not really valuable for someone to land on one of your tag pages. Putting all your links to your content pages inside H2 tags tells search engines that they're more important that other links on the page. The /title one is big. Google likes short URLs without a lot of extra cruft. Y…
You didn't really answer the question. I can do all of that work, how much do you think it will increase organic google traffic? 10%? 20%? This is an experiment I'm trying to do ;) My hypothesis is that these things won't make a significant difference.
> It's difficult to say exactly since SEO isn't really an exact science.
The answer is that there is no definite answer. :)