Extremely unlikely. I've said it a couple of times in this thread already... Carlton will not trade a contracted Gibbs unless it is a compelling offer for us, it's really that simple. It's not going to be a win-win for everyone concerned; if Gibbs is to be playing in anything other than Navy Blue next year, what most would consider an 'overs price' will have to be paid.
There is certainly no way we will be including a top 10 (potentially top 5) pick from a supposedly superior draft next year IMO. It would be an emphatic no.
What if it went the other way? Your outgoing included a draft pick from you this year and you got a first rounder from next year? Say your second from this year for Adelaide's first from next year?
If Adelaide turn Cameron and Lever into Gibbs and Francis (assuming Francis does a big running preseason) then they are certainly challenging again next year. Despite the "super draft" tag, it will be a late first round, so fairish.
Having said all that, seeing you guys are looking to challenge in 3-4 years time, wouldn't it make sense to get value out of Gibbs now? I think it would be bizarre not to.
If Essendon was bottom 4 I'd happily trade out Hurley or Hooker to market value, especially if it included a good pick for next year.