The "RDRAM problem" was mostly one of business model. Rambus doesn't manufacture anything but had IP to license for a fee. DRAM manufacturers didn't like the idea of paying a fee for IP. Since they usually trade patents with other manufacturers they are used to "no cash" arrangements.
This obviously didn't work with Rambus since Rambus didn't need to get patents for things they didn't manufacture.
There is some evidence that the DRAM manufacturers got together behind the scenes to ensure Rambus' failure. There are still cases being tried.
MTH was never a good idea and it had lots of technical problems.
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