Do I need a replacement attic vapour barrier after asbestos removal?
Safest bet is to replace it of course - but in your case I wouldn't call it necessary.  

There's an easier way to replace the vapor barrier.  Run the barrier over the trusses.  Keep it flush to the drywall but run it up over the truss and down again.

Of course, if your house is that old that it had vermiculite, I'm going to bet that you've got about 8 coats of paint minimum on your ceiling.  Undamaged that will serve as a vapor barrier in its own right.

If you do batt insulation, however, then the way to install the insulation is paper side down, and staple the paper to the trusses down at the bottom.  Not as good as wrapping the plastic over the trusses but its that or paperless.  Do not put the paper facing the attic.