Best days are behind him? He just ran a huge 1:45 PR his first race of the indoor season. Burnt out maybe but he's also coming off injury if you remember. You don't make a huge jump like that in one year and then just stop progressing all together. He may not get a whole lot faster but his best days are certainly not behind him. He WILL go faster than 1:46 again
For some people here, just a few short months ago he was surely running 1:42 this summer and be a lock for the Olympic team
I think that was Ventolin, who lives in an alternate reality that is not governed by logic.
Sub 1:45 would be a great target for Brazier. Hopefully he comes out of this bad patch OK, it is still early.