Multibridge: any hope for thunderbolt connection?

My Powermac Quad finally conked out and so I have a perfectly working Blackmagic Multibridge that I still use to output to betacam. I was wondering if there was an adaptor that would enable me to hook up the Multibridge to the newer Thunderbolt iMacs as I have no intention of purchasing a Macpro. Or is it ultimately cheaper to just buy an Intensity instead? Thanks!