The main problem with LEGO Ideas is that the average consoomer only wants something that references their favorite property.
I mean look t this
>>9271214 where at least 27 of the sets are immediate rejects simply because they have a licensing fee.
If you had a rule on the site that any property that isn't currently licensed by LEGO is immediately thrown out you would save a lot of this bullshit from getting there. 10k supporters is fine if you remove all the licensed properties. I count things like the Bentley in here as well (no current Bentley set, but there are VAG sets so they might be able to negotiate it).