I believe we will see all new dual core PCs with TPMs. I may be wrong in that there will still be options for people to get the PC without the TPM at all, but I think the overall majority will see them shipped with a TPM. The user at the time of purchase may not want one, but most PCs these days (especially at the home) are used for several years, if not longer, and to interface with newer web services, the TPM will need to be included.