As long as these netbook Linuxes remain well supported (firefox is updated, skype is updated, etc.) it doesn't matter. The way I see the netbook market is that there are three kinds of people:
1, Who will use Windows 2, Who will use whatever comes on the system 3, Who will customize the Linux to their needs.
1 and 3, matters not. 2 will be fine no matter who packaged their system as long as it remains supported. (I do have some concerns that it won't stay supported past a year or so.) Unfortunately people who need more services will switch to Windows or are Linux pros who will do it them selves for them selves...
I would love to see enough people in category 2 to create competition between the systems. Who can offer more? Package more/better software that you choose to install.