Yeah, I'm getting irritated of it too. But there are some people, predominately new posters, that have no clue of the previous discussions, and thus post their opinions without fear of the reaction.
Since he's been on for 10 years total, a big finish for him is definitely the way to go, if he is to leave at all. Because if we get the same bit as we did at the end of the Battle Frontier, there will be people wondering when Brock will be showing up, even if he is not intended to be there at all. A dramatic closing on his character will throw all worries to the wayside, and will give Brock the finish he needs.
And don't worry about the long post. I've done the same to you just now, and to other profiles as well .
Hey are you a fan of Jessie? If so, please join the Jessie Club! There will be an Anime style contest as a club competiition once we have enough members, so it should be fun, and you will get to show off your Pokemon!