Go for it, the biggest obstacle for you would be getting the people to join and participate, I have seen many people trying to make new 'better?' forums in the past but they all failed because they couldn't attract members.
Bitcointalk has come a long way where it is right now and it's almost the center hub to know anything and everything happening in the Bitcoin world. It's a trusted marketplace too, people come here to trade and they feel safe trading here (thanks to trusted forum escrows) and I think it can be a friendly place if you don't participate in controversies and forum politics. Just be a friendly, responsible member and care for the community you're part of and you'll see it's not bad at all.
I'm not worried about that.
And you should be, because this is the most important part. So far it seems that you want to create an Utopia instead of real life forum.
There is nothing wrong with your goal, but I don't think 'friendlier and more professional' forum will be possible to achieve judging by general bitcoin population.
