It's definitely matured enough, and Rovio initially intended to release a paid app alongside the free one.
However, they still haven't, and given that press release from a month or so ago stating they were on track to earn $1m per month from the "free" version, I'm starting to see why they haven't. I doubt they'd make anywhere near as much ongoing ad revenue if they released the game for a dollar or two.
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It's definitely matured enough, and Rovio initially intended to release a paid app alongside the free one.
However, they still haven't, and given that press release from a month or so ago stating they were on track to earn $1m per month from the "free" version, I'm starting to see why they haven't. I doubt they'd make anywhere near as much ongoing ad revenue if they released the game for a dollar or two.