Yoshi stated a while ago that there was a push to make 1-50 more simplified, and 50+ more complicated for synthing and ingredients. This sounds like a step along that line.
And remember, new tackle and lures are going to be introduced. It's just the existing ones will be removed. Considering right now, I did not need to buy a single piece of tackle or a lure after level 10, everyone I had I gained through leves. If I ran low (less than 10), I would just go and do more leves. By the time I made it into the 40s, all I was doing was leves, and I have had to resort to throwing them away because they don't sell. The tackle and lure system is definitely broken, and hopefully this will help in introducing a method where people can buy and sell them.