Linux for Alpha probably deserves some credit for getting everything 64-bit-ready years before x86-64 came out.
DEC (Compaq?) had some plans to make cheaper Alpha workstations, and while they managed to drive down the price somewhat, the volumes were never there to make them price-competitive with PC's. (See also the Talos Raptor POWER machines..)
Then came Compaq and its love for intel.