I don't think the market is too full, but I do think there can only be maybe 3, 4 at the very most, successful platforms. I wonder though if any other OS can establish a great degree of success until one of the two big players starts to fade for some reason. I definitely don't think all of these new players will last more than a year or so (not saying none of them will, but they will not all make it that far). It is really disappointing what has happened to Palm. I don't know how many other corporations have done this, but EAS support for all Palm devices is being yanked soon at the one I work for.
Developer of: SMS Auto Forward/Reply, GPS Viewer,
Keyring converters for CSV, eWallet, & CodeWallet
Touchpad Patches: Keyring HD, ClassicNote HD, YouTube HD (for 2.1 app)