They got money, they sell their CPU like hot cakes, Intel is weakest that time. It is the only time in the 40yrs that AMD actually leading Intel. If they continue strike new architecture that time it would be gain a lot of market share by then. it took Intel years to copy AMD integrated memory controller and put in in Nehelem CPU and Now Intel has woke up, it is far less likely they gonna make another screw up P4 and let AMD catch up again. 

If u dont know, the prime engineers team that design k6/Athlon/Athlon64 all left AMD due to bad management. AMD chip these days are use auto-craft tool that are less efficient than handcraft. Bulldozer are design by another diff engineer team.

Phenom II X4/X6 is nothing more than a tweak Athlon64. It is a 10yrs old architecture.