I think this kind of critic doesn't stand.

There's nothing stopping people with deep pockets from financing developments that please them right now. This organization per se won't make it easier or harder for them.
In the end, what matters is who people (=bitcoin users) trust. If well intended developers see the foundation has been bought by "an evil guy", they can simply leave it. Their reputation will leave with them.

The actual danger is not people buying up the organization. The actual danger is bitcoin users trusting this organization more than they should. The simple fact they don't accept anonymous memberships is already a reason to be wary, IMHO.