Your logic is flawed for bots that parse and render the pages. I have ran a small blog that I hand wrote from scratch and in the process found that around 4 years ago any phishing/spamming/harvesting bot worth it's salt will render the pages leaving these types of clever fix hacks useless.

The email address is "rendered" only on mouse click in my scheme, and something suggests bots don't go as far as clicking around on each page.