The run-up to the launch of the iPhone 4 may have gutted interest in RIM's BlackBerry as well as Motorola and Palm, ChangeWave determined in a new study. Those planning to buy an iPhone in three months' time logically surged from 31 percent in March to 52 percent in June, but BlackBerry demand was hit especially severely as it fell from 14 percent at the end of the winter to just six percent this spring. Motorola's lack of an update to the Droid also pushed it down to just nine percent, and Palm's quiet following the acquisition by HP has killed its demand altogethe