Then there's the oft-heard 'American pronunciation' defence. Interestingly, though, plenty of Americans do in fact use the British pronunciation, and no less authority than Merriam-Webster's Online Dictionary gives both pronunciations, but the British one first.
And of course, there is already a device pronounced 'rowter'. It's a woodworking tool, and its etymology is very different. So unless we are planning to carve channels in our networks, can't we just call them 'rooters' and get over it?