You're failing to take something into consideration. Most people use netbooks for very simple tasks?namely, surfing the Net and email. They're not designed to be anyone's main PC.
For this you don't need a 500-gig hard drive, any more than you need a big display, a quad-core processor, or a gaming video card (which is why netbooks don't have those things, and why they're so cheap).
Here on my desktop PC, which I've been using for several months now, my full system partition (including Windows 7 and its many files) has come in at just under 20 GB. I understand that Windows 7 even keeps copies of app installation files there---and I will have installed lots of apps I'd never need, or think of using, on a netbook.
For these reasons, I wouldn't hesitate to get a netbook with an SSD. The SSD's speed would also help compensate for the netbook's pokey CPU.
As for SSD's wearing out---it's hysteria. All hardware eventually wears out, even hardware with no moving parts (because of heat). But from all the research I've done, I've no doubt my desktop's SSD will be perking away long after I've replaced the spinning hard drives. Besides, who cares about keeping and using a netbook---or any PC, for that matter---for 6 or 7 years? Hardware and software change so quickly, it'll be like driving a Model T by then. (You may even be laughed at in public.)
Obviously, if you plan to load up your netbook with 100 GB of videos and MP3s, you wouldn't be considering one with an SSD anyway. So stop worrying. SSDs are great.