At the risk of getting slated isn't the whole Tracy thing getting a bit boring.
You won't be 'slated'. If you click on the 'longest story' link you'll find that some stories here are as long as 'War and Peace' so Mr Frank may still have some way to go! I remember one of those long stories kept me amuse for a couple of rainy days (Monica's Place)

If not when does a series such as this begin to lose its appeal?
That's easy. When it stops getting a response.