As to item 1, with the bankruptcy of Ugobe, pleo is now owned by a fairly large company (Jetta). While there are very few companies of the size of Sony, pleo does have a reasonably large and stable company behind it. Jetta will be around for a long while. But like the AIBO, if pleo is not a profitable product line, there is nothing to say it won't be dropped. Jetta had originally committed to keep pleo around for years to come, but the only way to guarantee pleo's long term survivability is to get more people interested!
As to item 4, we here have an obvious vested interest in keeping these forums going for many years to come. The good news is these forums have been pre-paid for the next two years . . . so even if we have another giant meteor crash into the planet and plunge us into another ice age, killing off all mankind and bringing back the age of the dinosaurs, they'll be able to see how much we loved them! We have members here who have also looked into rebuilding battery packs, fixing broken pleos, and keeping our aging pleos working. We are able to order batteries from companies other than PleoWorld.com, The biggest problem pleo owners face in keeping pleos going for 10 or more years may be the skin.