Everything has already been said in this thread by now, but here is my personal opinion, for what it’s worth:

Keep the game itself free, but add more things you can get for BP. I’m fine with things that cost BP and affect gameplay or grant a slight competitive advantage, as long as all of the core content of the game is free. I know people will rant about how some have a better chance in competitions and such, because they can donate. But let’s face it, if you could choose between not being able to play the game at all, and being at a disadvantage compared to donators, what would you choose?