In terms of the actual lottery being run entirely on blockchain, I would venture a guess to say a new chain should be created. As it were, aren't most chains going to be interoperable in the new environment anyways? If that is the case would there be a need for a new chain? These are things to consider. I lean toward the new chain.
Two Interesting Coincidences
(I don't believe in Coincidences)
First, the apparent diameters of the moon and sun
when seen from Cryptonomex World Headquarters in Blacksburg, Virginia
are nearly identical
Second, the time between when each tumbler on a (provably fair) slot machine clunks into place
and the time it takes to produce a real-time Graphene block
are nearly identical:
And don't get me started on the mean airspeed velocity of African vs. European swallows...