It won't matter one bit to eBay if the majority of small/hobby sellers (like myself and many, many others) disappear, they want us gone anyway - it's practically in the wording of their email anyway :

"This new fee is aimed at allowing serious businesses on eBay to continue operating a Store, while individual sellers should consider taking advantage of the 30 free listings* available every month."

I think it also boils down to the fact that they won't spend the money on getting more support staff to help with the daily issues the site has as it as anyway (in relation to disagreements regarding FB and DSR's etc), so better to trim a few of us off and keep the larger monthly fee's they get from the big sellers and reduce seller complaints.  I don't know, it's all a bit sad really, I'm sure the combined total of what the smaller/low turnover stores generate is quite large, but obviously not large enough to be worth the hassle in their eyes.

I'm just going to see how it goes, I'll keep on doing what I'm doing and see if it's still financially viable to keep a store and if losing my TSR really has much of an impact.

Good luck everyone - sad times ahead methinks!