In terms of ethnicity....no, I don't think it should play such a crucial role. I think adoption is based on trying to provide secure family life for children who don't have this, and security can be facilitiated regardless of race.
I do think that perhaps it should be a consideration, as I watched a show way back, and this black guy was adopted by a white couple, and he always felt like he couldn't fully relate to his family (although many children will say that of their own families, biological or adopted) but it might serve to create an additional barrier. But in terms of how much of a consideration it should be should depend on the individual child, and prospective parents.
I wish it was a world where it didn't matter what race you were, but in terms of security, race might play a role. But I don't agree with a flat refusal due to "race quotas". Thats bananas..a child is missing out on a good home purely because of that, and thats wrong.
I thin they said they were looking to overhaul the system completely. Thats good. How it will work in practice, I don't know. I don't know much about adopting/fostering, but it seems the waiting periods are insanely long, years on average. Given that psychologists argue that the most crucial years in child-rearing are the first 3-7, even if a child was going to be taken into care straight after birth, it would be years before they even had a firm adoption arrangement.
Times need to be shorter. I don't know what the situation is now, but in some less-beaurocratic (how do you spell it?) countries, I imagine people just adopt quick as lightening. Obviously that has its pitfalls, and can lead to many kinds of exploitation..but the main aim of giving a child a secure family life is achieved at a faster rate.