Overall system design question

Hi,

I am designing a product and have tested SPI x2, UART, Ethernet and USB Host that i need for the system.  

For the actual implementation i was thinking about having each of these communication interfaces (with DTC/DMA) on separate threads.

Then i would have one (or two if necessary) application threads that acts upon data coming in to the interlaces.  I realize i have to configure the priorities for each interface and thread but in general does this sound like a logical approach overall?

Thanks