I thought I could never give up a physical keyboard myself after having a Mogul, then TP, and TP2, but after having "upgraded" to the Hero for a bit (which I will be returning to get my upgrade credit reinstated to get the EVO this summer LOL) I've realized that I can, in fact, get used to the on screen keyboards... and as somewhat frustrating the Hero's kbd can be, a bigger screen i'm sure will make it even that much better...
Plus like someone else mentioned, I would not be surprised to see someone come out with a case that has a bluetooth keyboard built into it like has come out before for other phones, so there's where all the physical keyboard lovers could get their groove on