The great advantage of Ancestris is, that it is always 100% Gedcom compliant.
So after things are sorted out, users can turn to Ancestris to have there Gedcom 7 files tested for correctness.
In my opinion, when gedcom 7 is ready in Ancestris, you should start advertizing with that.
The fact you can use it to check Gedcom 7 files.
Then, when new users do that, they might stay with Ancestris.
When they found out the possibilities of it, while testing their Gedcom 7.
There will be no other program in the near future, that has that possibility!
Tineke