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No revolutions

Off loading the DSP has been common since the beginning. The early DAC chips didn't even have an onboard digital filter.

All the top CD players 15 years ago were using fancy DSPs in front of standard DAC chips to implement the reconstruction filter. Wadia had their DigiMaster + BB 1704. Simaudio and several others were using the Pacific Microsonics PM100/200 with a BB 1704. Audio Aero were using an Anagram algorithm on a SHARC DSP with an Analog Devices DAC. And the gold standard of digital playback for most of the last decade was EMM Labs, which upsampled Redbook to DSD. So the technology hasn't been changing much. Things have been getting better via refinements to existing approaches, no revolutions.

And 45 MHz is nothing special. Most parts support MCLK of 1024fs which is 42 MHz just for 44.1k Redbook. Some ESS DACs can take over a 100 MHz clock if you disable the internal oversampling and it seems that most people working with them are using MCLK in the 80-100 MHz range. No reason you couldn't go even higher, but you just increase the RF noise on your audio board.

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