Sounds like a good deal.... IF we were being realistic. But, your suggestion is not. We are talking about the distance from Florida to New York AND BACK AGAIN. I seriously doubt that can be completed in one year. Possibly two. And we already know that a wall is not required, at all, in some areas. I can see you trying to weasel out of this if there is not a solid brick wall along every inch of the border. LOL
This is akin to saying Trump is back-tracking on the Obama Care deal.
If I told you I would completely overhaul your car... and you had perfectly good wheels, glass, radio, seats, bumpers, hood, headlights, and trunk... it would make no sense to scrap those items if they were perfectly valid as they are, and working just fine. If I did all that, I would just have to end up replacing them with identical items..... and I would have wasted a ton of time and money in doing so.