To me, the perfect solution is - import your journal over to DW, and post from DW so that nothing is 'lost'. People have the option to reply here or there, and you, of course, can build a flist over there.

Most of the comms i follow are here on LJ, so i'm staying - I do the xpost thing and it's very simple, as was the import. So that's my solution, because there's too much to lose if i just abandon the lj ship.