In the absolute (TPM + DRM) I agree with you. In the case of the Nokia device, I don't. They allow to run another OS image with whatever you want.
But the crucial question is not there. Do we want to have a legal blue-ray player on Linux one day ? One that we can give legally to any administration of any country ? Yes ? Then we will have to use TPM, chain of trust, ...
And if we don't we will continue to have funny remarks such as : "what is the last innovation in your linux ? You have a legal DVD player ! Wow ! I am impressed !". And nice (proprietary, closed sources) competitors will continue to take the market.
So open source must not be incompatible with these technologies on a purely philosophical/ideological basis.