They can safely ignore Voyager. And Q flat out told Picard in the finale that the trial never ends.
There is one other problem with bringing Q back. John de Lancie has aged much since his last appearance in Voyager(did he make one in Enterprise). I will be obvious that he is much older. Qs are supposed to be omnipotent. I find it hard to believe they age.
That could be explained easily - he could WANT to look older to match Picard’s age or anything like that.
I have to say I have a bad feeling about bringing back Picard.
I have a bad feeling about Star Trek in general anymore. Once they started with the Kelvin timeline, they never should have returned to the original. The whole point of creating the Kelvin timeline was to start over and to leave the original universe to rest in peace. But now they have gone back to it. It is bound to confuse fans just getting into Trek. I think the continuity is so messed up and confused, I don’t think it can be fixed. I think I am done with it. Sorry.
Don’t be afraid, if the rumours are correct, the new Picard show will once and forever destroy the original timeline.